Spring loaded safety valve device. Spring safety valves

Spring safety valve (check point)- a type of pipeline fittings designed to automatically protect equipment and pipelines from excess pressure above a predetermined value by discharging excess working medium and ensuring the termination of discharge at closing pressure and restoring working pressure.

The main assembly units and parts of the valve:

1 - body, 2 - seat, 3 - spool, 4 - cover, 5 - stem, 6 - nut, 7 - stud, 8 - spring, 9 - bellows (installed in bellows valves), 10 - stop screw, 11 - adjusting sleeve, 12 - guide sleeve, 13 - baffle, 14 - adjusting screw, 15 - cap, 16 - threaded flange.

Principle of operation. At normal operating pressure, the force of the compressed spring presses the spool against the seat (the passage for the discharge of the working medium is closed). When the pressure rises above the set value, an oppositely directed force begins to act on the spool, which compresses the spring, and the spool rises, opening a passage for discharging the working medium. After reducing the pressure in front of the valve to the closing pressure, the spool is again pressed against the seat by the action of the spring, stopping the discharge of the medium.

Mounting position - vertical, cap up.

Shutter tightness- class "B" GOST R 54808. At the request of the customer, it is possible to manufacture with other classes of tightness.

Possible valve designs:

• A sealed cap with a forced opening knot, and without such a knot.
• Balancing bellows.
• Thermal barrier.
• "Open" lid.
• A locking element that prevents the valve from actuating.

Connection to the pipeline:

• flanged;
• under the lens spacer (flange according to GOST 9399);
• choke;
• tsapkovoe.

Bellows valves.

Bellows - a mechanism that compensates for the effect of back pressure at the outlet of the valve. The bellows is designed to protect the valve spring from harmful effects aggressive working environment in conditions of increased or low temperatures. Bellows valves are made of steel grades 12Kh18N9TL and 12Kh18N12MZTL and are designed for working environments with temperatures from minus 60 °C and below. Designation of bellows valves: KPP4S, KPPS.

The execution of sealing surfaces and connecting dimensions of the valve flanges are in accordance with GOST 12815-80, row 2, construction lengths are in accordance with GOST 16587-71.

Valves DN 25 PN 100 kgf/cm2 can be manufactured with union ends for connection to the pipeline in accordance with GOST 2822-78, as well as with flange connection in accordance with GOST 12815-80, row 2.

Safety valves with a nominal pressure of PN 250 kgf/cm2 and PN 320 kgf/cm2, like other models, are designed to protect equipment from unacceptable overpressure by automatically dumping excess working medium. They are used on equipment with liquid and gaseous working media that do not cause corrosion of body parts more than 0.1 mm.

Safety valves with a stamped body can be manufactured with individual construction length (L and L1), height (H) and connecting flange dimensions, which allows them to be used as substitutes for imported fittings without changing the already installed equipment and pipelines.

Calculation bandwidth valves - according to GOST 12.2.085-2002.

Setting pressure, Рn- the highest excess pressure at the inlet to the safety valve, at which the gate is closed and the specified tightness of the gate is ensured.

Pressure of the beginning of opening, Рн.о.(start pressure; set pressure) - excess pressure at the inlet to the safety valve, at which the force tending to open the valve is balanced by the forces holding the locking element on the seat. At the opening start pressure, the predetermined tightness in the valve gate is violated and the locking element begins to rise.

Pressure full opening, Rp.o.- excess pressure at the inlet to the safety valve, at which the armature moves and the maximum throughput is reached.

Closing pressure, Rz(resetting pressure) is an overpressure at the inlet to the safety valve, at which, after the working medium is discharged, the locking element is seated on the seat, ensuring the specified seal tightness. Valve closing pressure, Рz – not less than 0.8 Рn.

Back pressure- excess pressure at the valve outlet (in particular, from the safety valve).

The back pressure is the sum of the static pressure in the exhaust system (in the case closed system) and the pressure arising from its resistance during the flow of the working medium.

Mandatory minimum order information.

When ordering valves, you must fill out a questionnaire (Appendix B):

• product type, designation, type designation (according to the table of figures);
• nominal diameter inlet pipe, DN, mm;
• nominal pressure, PN, kgf/cm2;
• setting pressure (Рн, kgf/cm2) or spring number (if only the spring number is specified, the valve is adjusted to the minimum value from the range of the specified spring);
• case material;
• the presence in the valve design of the manual detonation unit;
• the presence of a bellows valve in the design.

An example of designation when ordering a safety spring valve:

An example of designation when ordering a safety spring valve DN 50 PN 16 kgf/cm2 made of steel 12X18N9TL with a manual actuation unit, setting pressure - Рн=16 kgf/cm2, model KPP4R according to TU 3742-005-64164940-2013:

Safety valve KPP4R 50-16 DN 50 PN 16 kgf/cm2, Рn=16 kgf/cm2, 17nzh17nzh. When placing an order, the need to complete the valves with mating parts (counter flanges, gaskets, studs, nuts; for valves DN 25 PN 100 - nipples with union nuts and gaskets).

Each node of the pipeline system plays an important role in ensuring its performance. For example, a safety spring valve is a pipe fitting necessary to protect against destruction when overpressure in the pipeline. This is possible by releasing the environment from the system.

Another spring valve ensures the termination of the discharge of the medium when the operating pressure is within the normal range.

Features and principle of operation

The spring-type safety valve is a direct-acting valve that operates from the medium. Where can excess pressure appear in the system? As a rule, the reason lies in external and internal factors:

• incorrectly assembled thermal mechanical circuit;
• heat transfer from sources;
• equipment is not functioning properly.

The spring-loaded safety sleeve valve is installed wherever there is a risk of excessive maximum pressure. As a rule, these are household or industrial storage vessels operating under pressure.

The great popularity of this fitting provides simple design, easy settings, product range. After all, such a variety and possibilities allow you to choose the optimal model for specific conditions.

The safety choke is mounted vertically. The device of a spring-loaded flanged safety valve implies the use of a disk valve as a locking element, which, when locked, is placed between the seats.

The downforce is set using a special tool and a pressure relief valve spring.

When the pressure is very high, the specified downforce is not enough to contain the medium, so the excess is removed until the pressure equalizes to the working level.

The passport for the safety spring valve allows you to find out about the design of the product. The main components are the setter and the locking body. The latter consists of a saddle and a shutter.

It is adjusted by means of a dial so that the spool is properly pressed against the seat to prevent the passage of medium. Adjustment is done with a screw.

The closing pressure of the gate is usually taken below the working one by 10 percent.

Product classification

Consider what types of safety products exist.

By the nature of the lifting of the closing body:

• two-position action;
• proportional action.

According to the height of the organ:

• full-lift;
• medium-lift;
• low-lift.

By type of load on the spool:

• cargo;
• magnetic spring;
• lever-spring;
• spring-.

According to the principle of action:

• direct - traditional safety products;
• indirect action - impulse devices.

One of the modifications widely used in industry is the angular safety spring choke.

Another principle of classification is according to the conditional diameter. For example, if a DN15 spring check valve is used, it means that nominal diameter is 15 mm, and the reverse spring coupling throttle Du50 is 50 mm.

Product characteristics

Throughput calculation is performed in accordance with GOST 12.2.085. The devices can be used in petroleum, chemical, gaseous and liquid media. Tightness is determined according to GOST 9789-75.

The closing pressure of the valve is more than 0.8 Pn, where Pn is the set pressure, which is the highest at the inlet to the valve, at which it remains in the closed state, while maintaining proper tightness.

Springs for them are most often made of steel 50HFA. spring check valve type 402 is made of cast iron.

In order to check the serviceability of the device in working order, the SPPK spring-loaded safety valve has a solution for manual opening, purging, therefore, products without SPPK do not have the possibility of manual opening.

The dimensions of the sealing surfaces of the flanges are determined in accordance with GOST 12815-80.

As an example of one of the modifications of the device, we give the fuse 17s28nzh, corresponding to TU3742-017-00218118-2002.

The device has the characteristics:

• working pressure - 1.6 MPa;
• workspace– non-aggressive, gas, steam, water;
• body material - steel;
• sealing material – stainless steel;
• connection - flange;
• temperature - from minus 40 to plus 250 degrees;
• weight and length depend on the nominal diameter.

Nuances of choice

To choose the optimal product, it is necessary to take into account the requirements that apply to them:

• timely and trouble-free installation of a safety valve with a specified increase in the level of working pressure in the system;
• in the open position, the necessary throughput must be provided;
• timely closing of the shutter with the desired level of tightness;
• ensuring stable operation.

Cost is important when choosing. For example, consider how much you can buy a safety spring valve 17s28nzh: the price of a reverse clutch spring throttle is from $300.

Of course, a lot depends on the manufacturer. So, a similar Danfoss spring check valve will cost more - from $ 400.

Features of the product (video)

Installation nuances

Before installing a safety spring valve, follow these simple steps:

• check labeling;
• inspect the case for external damage;
• remove the protective cap;
• inside there should not be any foreign objects;
• It should be remembered that during installation, the components of the product will heat up.

The installation process is carried out in accordance with current rules safety and regulatory and technical standards. The choice of location, design and number of valves, as well as the direction of the discharge of the medium, is determined by the project.

The place must be selected so that free access for maintenance and repair is provided. Installation is carried out in a vertical position at the top of the vessel. Also, the installation can be performed near the vessel or pipeline, only there should not be a shut-off device between the products.

The size of the fitting cannot be less than the diameter of the inlet pipe of the valve.

Spring loaded poppet valve with a large number plates can provoke an increase in their resistance, which can change the pressure difference in the upper and bottom parts of the product. Therefore, it should be installed in the last area.

Self-installation of such devices is a complex procedure that requires experience and certain skills. Therefore, it is necessary to turn to professionals.

Faults and repairs

The leakage of the medium through the valve occurs when the pressure is lower than the setting pressure.

• delay on the sealing elements of foreign objects - it is necessary to purge the throttle;
• damage to the sealing elements - turning or grinding is performed, followed by a leak test; if the depth of damage is more than 0.1 mm, it is necessary to perform machining;
• spring deformation - it is being replaced;
• misalignment of the elements due to a large load - the load is eliminated, the discharge and intake lines are checked, it is necessary to re-tighten the studs;
• reduced opening pressure - adjustment, deformation of the spring - it is being replaced;
• poor-quality assembly after repair - eliminate all assembly shortcomings.

Repair of safety spring chokes must be trusted to professionals. The cost of the procedure will cost from $50.

An obligatory element of equipping autonomous water supply systems in dachas and in country houses is a check valve. That's exactly what technical device, which may have different design, ensures the movement of fluid through the pipeline in the required direction. Check valves installed in the system autonomous water supply, reliably protect it from the consequences of emergency situations. Relating to direct acting valves, check valves operate automatically, for which the energy of the working medium transported through the pipeline system is used.

Purpose and principle of operation

The main function that a check valve for water performs is that it protects the water supply system from the critical parameters of the flow of liquid transported through the pipeline. Most common cause critical situations is to stop pumping unit, which can lead to a number of negative phenomena - draining water from the pipeline back into the well, spinning the pump impeller in the opposite direction and, accordingly, breakdown.

Installing a check valve on water allows you to protect the plumbing system from the listed negative phenomena. In addition, the water check valve prevents the consequences that water hammer causes. The use of check valves in piping systems allows them to work more efficiently, as well as ensure correct functioning. pumping equipment with which such systems are equipped.

The principle of operation of the check valve is quite simple and is as follows.

• The flow of water entering such a device under a certain pressure acts on the locking element and depresses the spring, with which given element is kept closed.
• After compressing the spring and opening the locking element, water begins to move freely through the check valve in the required direction.
• If the pressure level of the working fluid flow in the pipeline drops or the water begins to move in the wrong direction, the spring mechanism of the valve returns the shut-off element to the closed state.

By acting in this way, the non-return valve prevents the formation of unwanted backflow in the piping system.

When choosing a model of a valve installed on a water supply system, it is important to know regulatory requirements, which are presented to such devices by manufacturers of pumping equipment. Technical parameters, according to which, in accordance with these requirements, a check valve for water is selected are:

• operating, trial and nominal closing pressure;
• landing part diameter;
• conditional throughput;
• tightness class.

Information about how technical requirements must match the check valve for water, as a rule, is contained in the documentation for pumping equipment.

For equipping water supply systems household purpose spring-type check valves are used, the nominal diameter is in the range of 15–50 mm. Despite their compact size, such devices demonstrate high throughput, ensure reliable operation of the pipeline, low noise and vibration levels in the pipeline system on which they are installed.

Another positive factor in the use of check valves in the water supply system is that they help reduce the pressure created by the water pump by 0.25–0.5 atm. In this regard, the check valve for water allows you to reduce the load on both individual elements equipment of pipelines, and for the entire water supply system as a whole.

Design features

One of the most common materials from which the body part of the water return valves is made is brass. Choice this material not accidental: this alloy demonstrates exceptionally high resistance to chemically aggressive substances, which can be in the water transported through the pipeline in a dissolved or suspended state. Such substances, in particular, include mineral salts, sulfur, oxygen, manganese, iron compounds, etc. The outer surface of the valves, which is also exposed to negative factors during their operation, is often protected special coating applied by galvanic method.

The check valve device assumes the presence of a spool, for the manufacture of which brass or durable plastic can also be used. The sealing gasket present in the design of the check valve can be rubber or silicone. For the manufacture of important element locking mechanism - springs - use, as a rule, stainless steel.

So, if we talk about the structural elements of the spring check valve, then this device consists of:

• housing of a composite type, the elements of which are interconnected by means of a thread;
• a locking mechanism, the design of which includes two movable spool plates mounted on a special rod, and a sealing gasket;
• spring installed between the spool plates and the seat at the outlet of the through hole.

The principle of operation of the spring check valve is also quite simple.

• The flow of water entering the check valve at the required pressure acts on the spool and depresses the spring.
• When the spring is compressed, the spool moves along the stem, opening the orifice and allowing fluid to flow freely through the device.
• When the pressure of the water flow in the pipeline on which the check valve is located, or in cases where such a flow begins to move in the wrong direction, the spring returns the spool to its seat by closing the opening of the device.

Thus, the scheme of operation of the check valve is quite simple, but nevertheless ensures the high reliability of such devices and the efficiency of their use in pipeline systems.

Main types

Having understood how the check valve installed in plumbing system, you should also understand how to choose it correctly. On the modern market offered different kinds check valve devices, the design, material of manufacture and the scheme of operation of which can vary significantly.

Coupling Type Spring Check Valve

Valve body of this type consists of two cylindrical elements connected to each other by means of a thread. The locking mechanism includes a plastic stem, upper and lower spool plates. The position of the elements of the locking mechanism in the closed state, as well as their opening at the moment when the pressure of the water flow reaches the required level, is provided by a spring. Between themselves, the constituent elements of the body are connected using a sealing gasket.

Spring check valve with brass spool and spherical spool chamber

Distinctive features of this type of shutters are easy to see even in the photo. The brass body of such a valve in its middle part, where the spool chamber is located, has a spherical shape. Such design feature allows you to increase the volume of the spool chamber and, accordingly, the throughput of the check valve. The locking mechanism of this type of water valve, which is based on a brass spool, works on the same principle as in valve devices of any other type.

Combination spring type check valve with drain and air vent

For many of those who decide to independently engage in the installation of the pipeline system, the question often arises as to why a check valve is needed, equipped with drainage and air vent systems. The use of check valves of this type (especially for equipping pipelines through which hot working fluids are transported) makes it possible to simplify the process of installation and maintenance of such systems, increase their reliability, and reduce the total hydraulic pressure, reduce the number of field connections.

On the valve body of this type, which can even be seen in the photo, there are two branch pipes, one of which is used to mount the air vent, and the second serves as a drainage element. The branch pipe for the air vent, on the inner surface of which a thread is cut, is located on the device body above the spool chamber (its receiving part). Such a pipe is needed to bleed air from the pipeline system, for which a Mayevsky crane is additionally used. The purpose of the branch pipe, which is located on the opposite side of the body - at the outlet of the valve, is to drain the liquid accumulated after the valve device from the system.

If a horizontal non-return valve is installed, its air outlet can be used to mount a pressure gauge. If you put the combined check valve vertically on the pipeline, then its drainage pipe can be used to drain the water accumulated after such a device, and the air vent pipe can be used to remove air plugs from that part of the pipeline that is located before the check valve. That is why, when deciding how to install a check valve combined type, you should clearly understand what functions such a shutter should perform.

Spring loaded valves with polypropylene body

Check valves, the body of which is made of polypropylene, even if you look at the photos of such devices, outwardly very much resemble oblique bends. These types of check valves, for the installation of which the polyfusion welding method is used, are installed on pipelines also made of polypropylene. An additional oblique branch in the design of gates of this type is necessary to accommodate the elements of the locking mechanism in it, which facilitates the maintenance of such a device. Thereby constructive solution it is not difficult to carry out maintenance and repair of this type of check valve - it is enough to remove the elements of the locking mechanism from its additional outlet without violating the integrity of the device body and the tightness of its installation in the pipeline system.

Check valves of other types

Other types of non-return valves can be installed in pipeline systems designed for transporting water.

• The flap check valve is equipped with a special locking element - a spring-loaded petal. A big disadvantage of this type of shutters is that when they are triggered, significant shock loads are created. This negatively affects technical condition the valve itself, and can also cause hydraulic shock in the pipeline system.
• Double-leaf type check valve devices are compact in size and light in weight.
• The lifting coupling check valve includes a spool freely moving along the vertical axis as a locking element. The operation of the locking mechanism can be based on the gravitational principle, when the spool returns to the closed state under the influence of its own weight. A spring can also be used for this purpose. If you decide to install a gravity check valve on the pipeline, keep in mind that such a device can only be installed on vertical sections systems. Meanwhile, the gravity valve is characterized by simple structure, while showing high reliability during operation.
• There are check valves, the locking element of which is a spring-loaded metal ball. The surface of such a ball can be additionally covered with a layer of rubber.

Deciding which check valve is best and whether a piping system needs an expensive valve is more complex design, you should first get to know technical specifications such a device and compare them with the parameters of the pipeline system. The main purpose of the check valve, as mentioned above, is to pass water through the pipeline in the right direction and do not allow the flow of fluid to move in the opposite direction. In this regard, the check valve for water should be selected based on the pressure under which the water flow moves in the pipeline. Naturally, it is necessary to take into account the diameter of the pipes on which such a valve should be installed.

When installing the pipeline, it should also be borne in mind that a check valve can be installed different ways. Flanged and wafer type check valves are installed on pipes of large diameter, and sleeve valves are installed on pipes of small diameter. The welded method of installing check valves is mainly used when mounting on polypropylene and metal-plastic pipes.

If you choose the right check valve and the way it is installed, such a device will not only serve long time, but also ensure the correct operation of the entire pipeline system.

How to install correctly

Having dealt with the question of why a check valve is needed, and with its role in the pipeline system, you should also study the rules for installing it on an already operating or just being created pipeline. Such devices are mounted on various elements of pipeline systems:

• on pipelines of autonomous and centralized water supply;
• on suction lines served by deep and surface pumps;
• in front of boilers, storage water heaters and water meters.

If you are interested in check valves that can be installed both vertically and horizontally, choose not gravity, but spring models. You can find out in which direction the water flow should move through the valve using a special arrow printed on the body of the device. When installing sleeve-type check valves, be sure to use FUM tape for good sealing. In addition, one should not forget that check valves need regular maintenance, so they must be installed in accessible places in the pipeline.

When installing a non-return valve on the suction line submersible pump care should be taken to install a coarse filter in front of such a device, which will prevent mechanical impurities contained in groundwater from entering the inside of the device. As such a filter, a perforated or mesh cage can also be used, in which a check valve is placed at the inlet end of the suction line of the submersible pump.

When installing a check valve on an already operating pipeline, you must first disconnect the system from the water supply and only then install the shut-off device.

How to make a check valve yourself

The simple design of the check valve allows, if necessary, to make it yourself.

To solve this problem, you will need the following materials and tools:

• tee with internal thread, which will perform the function of the body;
• threaded socket outer surface- a homemade check valve seat;
• rigid spring made of steel wire;
• a steel ball, the diameter of which should be slightly smaller than the diameter of the hole in the tee;
• steel threaded plug, which will act as a stop for the spring;
• a standard set of locksmith tools and a FUM sealing tape.
(votes: 1 , average rating: 5,00 out of 5)

Safety valves are used on an industrial scale and are installed on highways in order to discharge excess flow of the working medium from the pipeline to reduce the pressure level (a type of household safety valve is the Mayevsky tap, which bleeds air from heating systems).

Design and types of safety valves

The main element of the safety valve is the valve, stem, adjusting elements, tuning springs. By design, safety valves are lever-load (the working medium presses on the spool, and this pressure is counteracted by the force of the load) and magnetic-spring (driven by an electromagnetic drive).

Types of safety valves:

• direct action. It works when the pressure is higher than normal;
• indirect action. They work when exposed to an extraneous impulse (for example, from an electric one, they are used for remote control);
• proportional action. Are applied in incompressible environments;
• two-position action.

Safety valve operation video

Also, safety valves are low-lift (the lift of the locking part is 1/20 of the seat diameter), full-lift (1/4 of the seat, designed for high-capacity highways), medium-lift. Check valves are a type of safety valve. Also, safety valves are divided into shut-off and control valves. The limit pressure setting is carried out at the time of installation by changing the position of the adjusting screw that compresses the pressure spring.

• We recommend spring loaded safety valves! Unlike membrane valves, they are equipped with additional devices that prevent the spool from freezing to the seat.

If you have visited our site, then you are looking for where to buy shut-off pipeline valves at the best price. You have made the right choice! Online catalog "Proftile" offers you the best prices from suppliers without intermediary margin. When buying components in the amount of 3000 rubles, you get wholesale prices and prompt delivery within 3 days.

• Please note that the site offers more than 5 payment options, but some of them have a commission. Contact the manager to choose the best complete set of valves at the best price!

Online catalog "Proftile": successful partnership is the key to trust and long-term cooperation!

To release excess pressure into the atmosphere, safety spring valves are used, which are special pipeline fittings that provide reliable protection pipeline from malfunctions and mechanical damage. The device is responsible for the automatic discharge of excess liquids, steam and gas from vessels and systems until the pressure is normalized.

Purpose of the spring valve

Dangerous overpressure in the system occurs as a result of external and internal factors. The increase is caused by both incorrect collection of thermal and mechanical circuits, causing malfunctions in the operation of equipment, heat entering the system from extraneous sources, and internal system physical processes, which are not provided for by standard operating conditions that periodically occur in the system.

Safety products are an indispensable part of any household or industrial pressure system. Installation of safety mechanisms is carried out on pipelines in compressor stations, on autoclaves, in boiler rooms. Valves perform protective functions on pipelines through which not only gaseous, but also liquid substances are transported.

The device and principle of operation of spring valves

The valve consists of a steel body, the lower fitting of which is used as a connecting element between it and the pipeline. If the pressure in the system rises, the medium is discharged through the side fitting. The spring adjusted depending on the pressure in the system ensures that the spool is pressed against the seat. The spring is adjusted by means of a special bushing, which is screwed into the top cover located on the body of the device. The cap located in the upper part is designed to protect the bushing from destruction as a result of mechanical influences. The presence of a special lug for sealing allows you to protect the system from outside interference.

For valves in which a spring acts as a balancing mechanism, the force of the working body is selected. If the parameters are chosen correctly, in the normal state of the system, the spool responsible for releasing excess pressure from the pipeline should be pressed against the seat. When performance increases to a critical level depending on the type spring device the spool moves up to a certain height.

The safety spring valve, which provides timely pressure relief, is made of different materials:

• Carbon steel. Similar devices suitable for systems in which the pressure is in the range of 0.1-70 MPa.
• Stainless steel. Valves made of stainless steel are designed for systems, the pressure in which does not exceed 0.25-2.3 MPa.

Classification and characteristics of spring valves

The safety spring valve is available in three versions:

• Low lift devices suitable for gas pipeline and steam pipeline systems, the pressure in which does not exceed 0.6 MPa. The lift height of such a valve does not exceed 1/20 of the seat diameter.
• Medium lifting devices, in which the spool lift height is from 1/6 to 1/10 of the nozzle diameter.
• Full lift devices, in which the valve lift reaches up to ¼ of the seat diameter.

Known classification of valves based on the way they open:

• Check spring valve. To control the check spring valves, an indirect external pressure source is involved. Reverse spring valves, which are called impulse safety devices, can work through the action of electricity.
• Straight valve. In devices direct type the operating pressure of the medium has a direct effect on the spool, which rises when the pressure increases.

Allocate open valves and closed type . In the case of a direct type device, when the valve is opened, the medium is discharged directly to the atmosphere. Closed type valves remain completely sealed against environment, relieving pressure in a special pipeline.

Advantages

There are various types of equipment that provide relief of excess pressure from the system, but spring safety valves are popular due to the presence of important advantages:

• Simplicity and reliability of a design.
• Ease of setting the operating parameters and ease of installation.
• Variety of sizes, types and designs.
• Installation of a safety product is possible both in horizontal, and in vertical position.
• Relatively small overall dimensions.
• Large cross section.

The disadvantages of safety valves include the presence of limitations in the lift height of the spool, increased requirements for the quality of manufacturing of the spring for safety valves, which can fail when operating in an aggressive environment or constant exposure to high temperatures.

How to choose a spring valve?

When choosing a fuse, it is worth relying on several important principles, the consideration of which depends on the uninterrupted operation of the system and the ability of the fuse to perform the necessary functions:

• Spring Relief Valves are smaller than other types of Relief Valves and should therefore be selected where space is not available.
• Features of the use of valves are associated with the presence increased vibrations, which adversely affect the performance of the device and can quickly render it unusable. For example, lever-type devices are more prone to breakage due to vibration due to the presence of a long lever with weight and hinges in the design. Therefore, for systems in which significant vibration effects are observed, it is worth choosing a safety spring valve.
• Depending on the design features of the device, the spring can change the pressure force over time. This is due to the fact that the constant rise of the spool causes changes in the structure of the metal.

Installation nuances

A spring-type safety valve is installed at any point in the system that is subjected to high blood pressure and is at risk of mechanical damage. The device does not require a large free space, which is a significant advantage compared to other types of safety devices.

In order to avoid malfunctions, do not install any valve upstream of the safety valve. stop valves. To discharge the gaseous medium, special devices are installed or the discharge occurs directly into the atmosphere. To alert personnel, along with spring valves, a special whistle is mounted, which is placed on the discharge pipe. When the valve is actuated, a whistle will sound to indicate that the system has been pressurized and the valve has opened to release media.

Possible causes of safety valve failures

Safety valves are robust and reliable devices that provide permanent protection of systems against overpressure. A direct or check spring valve fails for several reasons:

• The presence of increased vibrations;
• Constant exposure to aggressive media on the safety throttle.
• Incorrect installation of the safety spring throttle or valve.

In order to avoid accidents and malfunctions in the functioning of systems, safety valves are periodically checked for malfunctions. Valves are tested for strength and tightness before being put into service. Periodic checks are also carried out to determine the tightness of sealing surfaces and stuffing box connections.

At right choice safety devices, taking into account the parameters of the system, carrying out periodic checks and timely troubleshooting, spring-loaded safety valves will ensure reliable operation of the system and trouble-free protection against overpressure for a long time.