SU870829A1

SU870829A1 - Safety valve

Info

Publication number: SU870829A1
Application number: SU802862735A
Authority: SU
Inventors: Борис Васильевич Климов
Original assignee: Предприятие П/Я М-5755
Priority date: 1980-01-04
Filing date: 1980-01-04
Publication date: 1981-10-07

Description

(54) ПРЕДОХРАНИТЕЛЬНЫЙ КЛАПАН(54) SAFETY VALVE

1one

Изобретение относитс к предохранительной гидроарматуре.This invention relates to safety fittings.

Известны предохранительные клапаны с неподвижным седлом, запорным органом и подвижным элементом в виде мембраны, воздействующей на запорный орган при определенном давлении 1.Known safety valves with a fixed seat, a shut-off member and a movable element in the form of a membrane, acting on the shut-off member at a certain pressure 1.

Недостатком известных клапанов вл етс зависимость величины контактного давлени по стыку запорного органа с седлом от величины давлени рабочей среды и значительное гидросопротивление его, обусловленное относительно небольшим подъемом затвора.A disadvantage of the known valves is the dependence of the magnitude of the contact pressure at the junction of the closure member with the saddle on the magnitude of the pressure of the working medium and its considerable resistance due to the relatively small rise of the bolt.

Наиболее близким техническим решением вл етс предохранительный клапан, содержаш;ий нагруженный пружиной в направлении седла поршень и-затвор, разде1ЯЮЩИЙ напорную полость от сливной и установленный в центральном отверстии поршн с возможностью совместного перемешени , ограниченного в пр мом направлении фиксацией поршн , а в обратном - затвора 2.The closest technical solution is a safety valve containing a piston and a valve loaded with a spring in the direction of the seat, separating the pressure chamber from the drain and installed in the central hole of the piston with the possibility of joint mixing, limited in the forward direction by fixing the piston, and in the opposite direction shutter 2.

Этот клапан начинает пропускать среду раньше, чем давление в системе достигнет настроечного. По вление утечек жидкостиThis valve begins to flow through the medium earlier than the pressure in the system reaches the set-up. Appearance of fluid leaks

может вызвать эрозию уплотнительных поверхностей , что в свою очередь приводит к дальнейшему увеличению негерметичности.may cause erosion of sealing surfaces, which in turn leads to a further increase in leakage.

Цель изобретени - повышение г ерметичности .The purpose of the invention is to increase the g of air tightness.

Эта цель обеспечиваетс тем, что поршень установлен между напорной и сливной полост ми, отверстие в нем выполнено сквозным , а затвор выполнен в виде полого стакана , открытый торец которого разобщен в закрытом положении клапана с напорной полостью, причем на стенке стакана выполнены радиальные отверсти , перекрываемые поршнем при его совместном с затвором перемещении в пр мом направлении.This goal is ensured by the fact that the piston is installed between the pressure and drain cavities, the hole in it is made through, and the valve is made in the form of a hollow cup, the open end of which is disconnected in the closed position of the valve with the pressure cavity, and on the wall of the cup there are radial holes blocked the piston when it is combined with the slide in the forward direction.

На фиг. 1 изображен клапан в закрытом положении; на фиг. 2 - то же, в проме 5 жуточном положении; на фиг. 3 - то же, в закрытом положении.FIG. 1 shows the valve in the closed position; in fig. 2 - the same, in the intermediate position; in fig. 3 - the same, in the closed position.

Claims

The safety valve consists of a housing 1, on the inner end of which a poppet seat 2 is made. In the case between the pressure A and the drain A piston 3 is installed in the cavities 20. A through hole is installed in the center of the piston, in which is installed a hollow cup and having the ability to move -DON the piston 3 due to the small gap between the channel wall and the gate. There are radial holes 5 in the gate, which enter the cavity B. The open end of the glass has an annular protrusion with seal B, which contacts to the rear. the closed position of the valve with a saddle 2. At the opposite end of the valve on the side of cavity B there is a stop 7 with an annular collar 8. Between the collar 8 and the end of the bolt 4 there is a seal 9. Inside the housing 1 there is a spring 10, which through the piston 3 presses the bolt to the saddle 2 The spring compression force is regulated by the threaded sleeve 11. Outside, the housing I is closed by a cover 12 with a drain hole 13 and is sealed with a gasket 14. The safety valve operates as follows. When the pressure in cavity A increases, the piston 3, overcoming the compressive force of the spring 10, begins to move upwards, while the valve 4 remains stationary, as it presses to the slow pressure acting on the unbalanced-area. As the piston rises, the drain holes 5 in the gate overlap with the surface of the central channel (see Fig. 2), after which a cavity B is formed inside the gate. The pressure in this cavity is almost equal to the pressure in the drain cavity, since there is a small gap between the gate and the wall the central channel contributes to the drainage of the medium into the drain cavity with incomplete tightness of the valve. With a further increase in pressure in cavity A, piston 3, resting against sealant 9, seals cavity B from the side of the drain cavity; acting through the seal 9 on the collar 8, the piston starts to raise the shutter 4, while the contact pressure at the seal location of the shutter will decrease, which will cause an increase in fluid pressure in cavity B. With the adjusting pressure, the shutter detaches from the saddle and takes the extreme upper position (see FIG. 3). At the same time, the cavity A through the openings 5 is connected with the drain cavity, while the pressure in cavity A decreases and the piston under the action of the spring begins to fall down, displacing the fluid into the drain cavity and maintaining a pressure in cavity A, pressing the valve against the piston. As a result, the bore passages of the shutter will be fully open before landing on the body saddle. After the valve is seated on the saddle 2, the pressure chamber disengages from the cavity, the drain and the valve returns to its initial position. The valve provides automatic sealing of the system after pressure relief, which eliminates unnecessary loss of medium. Claims of Invention A safety valve comprising a spring loaded in the direction of the seat, a piston and a shutter separating the pressure chamber from the drainage and installed in the central hole of the piston with the possibility of simultaneous movement limited in the forward direction by fixing the piston, and in the opposite direction the shutter differing in that In order to increase the tightness, the sprit is installed between the pressure and drain cavities, the hole in it is made through, and the shutter is made in the form of a hollow cup, the open end of which is n in the closed position of the valve with a pressure cavity, and on the wall of the glass there are radial openings that are blocked by the pistol when it moves along with the valve in the forward direction. Sources of information taken into account in the examination 1. Kondratieva T. F. Safety valves. M., “Mashinostroenie, 1976, p. 25, fig. 5 a.

2. USSR author's certificate number 524035, cl. F 16 K 17/04, 1974.