SU681277A1 - Safety valve - Google Patents

Description

(54) PROTECTION CLIP

The invention relates to valves. I A safety valve is known in whose housing between an inlet and outlet cavities are located. A spring-loaded locking member and a sensing element made in the form of a spring-loaded piston. The disadvantage of this valve is the impossibility of checking it. operation at a pressure below the operating response pressure. Another safety valve is known, in the case of which a spring-loaded shut-off valve and a main sensing element, a control pressure pipeline and an additional shut-off member are located between the inlet and outlet ports. The disadvantage of such a valve is the difficulty of checking its valve performance due to the need for extraneous control pressure. The goal and the goal is to improve the performance of the valve by ensuring that it can be adjusted to the required pressure and can be operated at the working pressure. This is achieved by the fact that the piston cavity of the second stage of the sensing element communicates with the input cavity by the channel in which the locking device is installed. The drawing shows the proposed safety valve, a general view. The safety valve consists of a housing 1 with an inlet 2 and an outlet 3 cavities loaded with a spring 4, and a sensing element made in the form of a two-stage PERSON 5 with a seat 6 and channels 7 and 8. The saddle is blocked by a locking member 9 with a pusher 10 loaded with an additional spring 11. The piston cavity of the second stage 12 of the piston 5 is connected by a channel 13 to the entrance cavity 2. The channel 13 is blocked by a locking device 14. An adjusting screw 15 is screwed into the housing 1. The area of the stage 12 constitutes such a part of the main stage area The main element, which part of the working pressure is the required excess pressure, is: at which the valve should operate. The valve operates as follows. With the supply of working medium into the inlet cavity 2, its pressure tends to press the locking organ-9 against the saddle 6;

in this case, the closure member, together with the seat, moves upwards, compressing the spring 4.

With increasing pressure, the sealing force increases until the working pressure in the inlet cavity approaches the limiting (setting pressure),

From this moment, with increasing pressure, the forced opening of the closure member 9 from the seat begins. B. The removal of the sealing force is due to the fact that the pusher 10 of the locking member 9, reaching the screw 15, stops and the piston 5 with the seat b under the action of increasing pressure continues to move, compressing the spring 4. The working medium from the inlet cavity 2 through the annular gap the shut-off organ 9 and the saddle b through channels 7 and 8 are discharged into the atmosphere (drainage line),

During daily operation, the valve device 14 is closed, the operating screen is in, the piston chamber of the stage 12 of the piston 5 does not flow through channel 13.

The valve is set to the required actuation pressure as follows.

With the working pressure of the medium in the inlet cavity 2, the adjusting screw 15 is turned out of the housing 1. This corresponds to setting the valve to the opening pressure, more than the required pressure. After that, the device 14 opens. The working medium from the inlet cavity 2 through the channel 13 enters the sub-piston cavity of the piston stage 12. This is equivalent to increasing the pressure of the working medium to the value at which the valve should operate (open /. Under increased pressure 1m on the piston 5, the latter rises upwards, compressing the spring 4. After that, the adjusting screw 15 is screwed in before the valve starts to open output cavity 3). This will occur after the adjusting screw 15 is pressed into the pusher 10 and pushes the locking member 9 away from the seat 6. After

this device 14 is closed. In this case, the piston cavity of the second stage 12 of the piston 5 and the entrance cavity 2 are separated, the medium from the piston cavity of the stage 12 of the piston is discharged into the atmosphere (drainage line) through the locking device 14. The force of the pressure on the piston decreases abruptly, and the latter under the action of the spring 4 descends. The pusher 10 moves away from the adjusting screw 15. The locking member 9 closes the seat 6 under the action of the working medium and the spring 11. The valve closes.

The control setting of the safety valve is carried out as follows.

When the pressure is set and recalculated from the actuation operating pressure, the locking device 14 opens, when the valve opens and the working medium flows into the output cavity 3.

Thus, the proposed safety valve provides an Actuation Test at a Pressure below the operating operation pressure.

Claims (1)

Invention Formula A safety valve, a housing with an entry and exit cavities, is spring-loaded and made in the form of a two-stage piston, the smaller steps of which are facing the inlet, the sensing element in which the saddle is made, the channel of which is blocked by the locking member, and so that, in order to improve performance by allowing the valve to be adjusted to the required response pressure at operating pressure, the second-stage piston chamber of the sensing element communicated with the input cavity channel in which the locking device is installed.