SU1451396A1 - Safety valve - Google Patents

Abstract

The invention relates to a valve and is designed to shut off the flow of the working medium in the event of accidental destruction of the pipeline. The purpose of the invention is to increase the reliability of the safety valve by reducing the likelihood of piston seizure by particles of mechanical impurities contained in the working environment. When supplying the working medium to the piston 6, the inlet pressure starts to act on one side. on the other hand, the output pressure and the compressive force of the spring 7. In case of rupture of the pipeline connected to the output channel 4, the increase in pressure drop overcomes the compressive force of the spring 7 and displaces the piston placed in chamber 2 until it stops by the locking member 5 of the output channel 4. Flowing through the gap between With the piston 6 and the wall of the chamber 2, the working medium first enters an annular groove 12 formed on the side surface of the piston 6, and from there, along the longitudinal grooves 13, enters the schtok cavity 9, from where It goes to the outlet channel 4. The flow of the working medium, organized only on the side surface of the piston which is insignificant in size, reduces the likelihood of particles in the gap between the piston 6 and the wall of chamber 2. 2 Il. 7/7 6 73 in I III i (Л 4 СЛ СО с О5

Description

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The invention relates to reinforcement and is intended to carry out shut off of the flow of the working medium in case of emergency destruction of the output pipeline.

The purpose of the invention is to increase the reliability of the safety valve by reducing the likelihood of piston seizure by mechanical particles from the pressure line into the cavity 8 of chamber 2. In this case, the piston 6 from the side of the cavity 8 is acted upon by the working medium, and from the rod end 9 - output pressure and spring pulling force 7. Under the action of this pressure drop, the working medium, together with the dense microparticles it brings, flows through the initial part of the gap between

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FIG. 1 shows a fuse-10 piston 6 and chamber 2, and then enters

ny valve, general view; in fig. 2 - a part in the annular groove 12 and along the longitudinal side of the piston with the diagram to the diverging grooves 13 - the rod end 9,

limit the current tov lines of the working medium. after which through the opening 10 enters

The safety valve contains a core to the drain cavity of the housing 1 and further to the outlet 1, in which chamber 2 is made, a common channel 4. At full or partial pressure and discharge in the housing 1, the pipeline collapses into the cavity. The housing 1 is provided with an input line connected to the output channel 4, pressure 3 and output 4 channels, while the salinity in cavity 9 decreases, which causes the output channel 4 in the housing to increase the steady pressure 5 The rod is located on the piston 6. At a certain flow in the chamber 2 and connected to the set-20 of the pressure differential, the piston 6 is replaced by a piston b in it, the output channel 4 is shifted and loaded,

spring 7 toward the opening of the closure member 5. With its free end, the piston 6 forms a cavity 8 in chamber 2 and senses the inlet pressure of the working medium. The rod cavity 9 of the chamber 2 communicates with the output channel 4 of the housing through the opening 10. The overflow and the pressure cavities of the housing 1 communicate with each other through the throttle holes 11. On the side

Claims (2)

associated with the damaged line. Invention Formula A safety valve in which the chamber is provided with an inlet and outlet channels, and a stop valve is placed, the stem of which is passed into the chamber and connected to the one installed in the surface of the piston 6 from the side-. By means of a piston loaded with a spring, the shut-off member opens the working pressure of the working medium and permits its free end to receive the input pressure of the working medium, the stem chamber of the chamber communicating with the outlet channel of the housing, characterized in that An annular groove is made on the side surface of the piston from the side receiving the pressure of the working medium, and along its axis are longitudinal grooves, each of which indicates choke holes 11 - in the drain 40 annular groove with a rod cavity highway. At the same time working chamber. an end face has an annular groove 12, and along its axis longitudinal grooves 13, each of which communicates said annular groove with the rod cavity 9 of chamber 2. The safety valve operates as follows. The working medium under pressure flows from the pressure line through the inlet channel 3 into the cavity of the housing 1, and through The medium from the pressure line is fed into the cavity 8 of the chamber 2. In this case, the piston 6 from the side of the cavity 8 is influenced by the input pressure of the working medium, and from the rod end of the cavity 9 by the output pressure and the force of tightening of the spring 7. Under the influence of this pressure differential, the working medium together with the dense microparticles it brings through impurities the initial section of the gap between piston 6 and chamber 2 and then enters associated with the damaged line. Invention Formula / J fiv.2