FR2483037A1 - ANTI-RETURN VALVE EQUIPPED WITH A SHOCK ABSORBER - Google Patents

Abstract

THE INVENTION RELATES TO A NON-RETURN VALVE EQUIPPED WITH A DAMPER BLOCK. THE DAMPER BLOCK CONSISTS OF A HOLLOW BODY 15 CLOSED BY A BALL 19, AND AGAINST WHICH THE SHUTTER 11 STOPS DURING THE VALVE CLOSING PROCESS, IN ORDER TO REDUCE ITS CLOSING SPEED. APPLICATION TO NON-RETURN VALVES, ESPECIALLY FOR GAS FLOWS.

Description

This invention concerns an anti-tamper

  return for gas flow, equipped with a rigid shutter

  movable in a body, as well as a device for

  firing the guided movement of said shutter during closure of said valve. This damping has the effect of preventing the shutter from being pressed violently against its seat and preventing the resulting stress imposed on the flapper /

  due to the significant braking by forces of inertia.

  It is known to obtain such damping by an air cushion which is formed between the shutter and the body when closing the valve. However, this

  damping acts in both directions of

  shutter, resulting in an untimely delay in opening said valve. In addition, the necessary adjustments lead to relatively complicated operations. The present invention therefore aims to overcome these disadvantages and to propose a

  effective damping device, acting on the ob-

  only in the sense of closure and can be

realized in a simple way.

  According to the essential characteristics of the invention, the valve is equipped with a damping block which, when said valve is open, is pushed by a spring against a stop disposed in the body of said valve and against which the shutter abuts during its closure , shortly before reaching its closed position, in order to slow down its speed

closure.

  The invention can be applied using simple embodiments. No close manufacturing tolerances should be respected. Temperature variations have no effect on the operating mode. Moreover, to suppress oscillations, the damping block consists of a hollow body filled with

  particles of a fine-grained material.

  Under these conditions, the damper block can also be modified in a simple manner, increasing or decreasing the filling volume, so be adapted to the needs. The invention will be described in more detail with reference to the accompanying drawings by way of non-limiting example and whose single figure is a longitudinal section.

  fragmentary version of a non-return valve equipped with a

shock absorber.

  The left part of the figure illustrates a check valve in the closed position, while its right side illustrates said valve in the open position. This valve comprises a shutter 11 movable in a body 12. A spring 13 acts on the shutter 11 in the closing direction. When there is sufficient gas pressure

  (represents an arrow 14), the valve is open.

  A damping block consists of a hollow body, filled with particles 18 of a fine-grained material and closed by a ball 19. Thus, in a known manner

  damping of movements of said block and an oscillation

  lation is rapidly faded.

  When the valve is open, the damping block is pushed by a spring 16 against a stop 17 formed in the body 12. When closing the valve, the shutter 11 abuts against the hollow body 15 of the damping block, shortly before to reach his closed position. This results in a slowing of its closing speed and, as a result, the coming into contact of said shutter against

  his seat in the body is damped.

  It goes without saying that many modifications

  can be made to the described nonreturn valve and-

  represented, without departing from the scope of the invention.

2 4-83o37

Claims (2)

  1. Non-return valve for gas flows, comprising a rigid shutter, movable in a body, and a device for damping the displacement of said shutter during closure of said valve, valve characterized in that it comprises a damper block , pushed by a spring (16), when said valve is open, against a stop (17) formed in the body (12) of said valve, and against which said shutter (11) abutted during   the closing process, shortly before reaching its   closed, in order to slow down its closing speed.   2. Non-return valve according to claim 1, characterized in that its damping block consists of a hollow body (15) filled with particles (18) of a material to fine grains.