CN206988535U - A kind of low-pressure gas pipe road excess flow valve - Google Patents

Abstract

A kind of low-pressure gas pipe road excess flow valve; can be with automatic sensing gas circuit flow; gas circuit flow can be closed automatically after flow exceedes preset value; gas-tight after closing; for imflammable gas gas circuit; this will form a kind of inflow-rate of water turbine automatic safe protective mechanism, and this excess flow valve individually can be fixedly mounted or depend on other parts in pipeline and be fixedly mounted, and can effectively prevent the generation of fire disaster or explosive security incident.

Description

A kind of low-pressure gas pipe road excess flow valve

Technical field

It the utility model is related to a kind of used stream valve of low-pressure gas pipeline.

Background technology

Excess flow valve is also known as super flow stop valve, typically refers to fluid flow more than generation protectiveness flow after preset flow The device of cut-out.Excess flow valve for low pressure imflammable gas gas circuit can automatically generate excessively stream during or de- pipe excessive in downstream flow Cut-out, can effectively prevent the generation of fire disaster or explosive security incident.The gas circuit excess flow valve of below 15kPa combustion gas at present, The requirement of CJ/T180 standards is performed, leakage flow is less than 1.0L/h after standard regulation excessively stream.A kind of low-pressure gas pipe road excess flow valve, It is formed on the basis of development test repeatedly, and it is installed on below 15kPa low pressure gas circuits, automatic sensing gas circuit flow, when Flow can close gas circuit flow, gas-tight after closing automatically after exceeding preset value.For imflammable gas gas circuit, this is by shape Into a kind of inflow-rate of water turbine automatic safe protective mechanism.

The content of the invention

The utility model provides a kind of low-pressure gas pipe road excess flow valve, and it is mainly characterized by：It by excessively stream valve, steel ball and The parts such as O-ring seals form；Excessively stream valve both ends can be connected fixation with parts such as gas circuit pipe fitting or pressure regulators, close to steel Realize that connection installation is fixed and seals by the additional O-ring seals of a screw thread outside pearl one end；Excessively stream valve built with One spacing back-up ring, a steel ball, an O-ring seals, followed by there is a resetting shaft, it pressed against a back pressure spring, bullet There is a reset cradle spring rear end；Have between spacing back-up ring, resetting shaft, reset cradle and excessively stream valve and fill the hole that gas perhaps passes through Gap；Resetting shaft can only move axially along excessively stream valve；Have outside excessively stream valve for installing the spanner side being connected and fixed；Cross gas Mouth lateral surface has a stepped hole, there is an O-ring seals in hole, and sealing ring is compressed by a plain cushion, there is one above plain cushion Back-moving spring, an E shape jump ring is headed on above spring, and E shape jump rings are stuck in the groove for resetting operating shaft；One reset seat passes through Screw thread compresses plain cushion and limits the upward position of E shape jump rings；Operating shaft one end is resetted to be closely linked with SR；It is multiple There is an inclined-plane position operating shaft lower end, and this inclined-plane is in uppermost position in fig-ure under normal circumstances, will not be to the shifting of resetting shaft vertically Movable property life interference；Have non-disc in SR, with the outer non-disc of reset seat formed it is chimeric prevent reset operating shaft rotate.Just In the case of often, steel ball is on spacing back-up ring inner face, and air-flow flows through the hole of spacing back-up ring end face, through in steel ball and spacing back-up ring Gap between face, then through O-ring seals and resetting shaft, the hole of reset cradle, from the other end of excessively stream valve along gas circuit stream It is logical；After gas flow exceedes preset value, steel ball is pressed on O-ring seals position under air-flow drive and realizes that gas circuit is closed automatically Cut-out, while press against resetting shaft and move right；It is pressed when resetting operating shaft, its inclined-plane can limit the right end position of resetting shaft, And ensureing that steel ball can not be adjacent to O-ring seals, steel ball can be rolled under axial thrust effect caused by deadweight and back pressure spring Formed and resetted on the inner face of spacing back-up ring.

Technical scheme

A kind of low-pressure gas pipe road excess flow valve provided by the utility model, this excess flow valve can individually be fixedly mounted or according to Invest other parts in pipeline and fix peace, for example be directly anchored to pressure regulator outlet；It is close that it includes excessively stream valve, steel ball and O shapes The parts such as seal；Excessively stream valve realizes connection installation outside steel ball one end by the additional O-ring seals of a screw thread Fixed and sealing；Excessively stream valve is used for steel built with a spacing back-up ring, a steel ball, an O-ring seals, spacing back-up ring Pearl is spacing, and O-ring seals are positioned；Followed by there is a resetting shaft, a back pressure spring is pressed against, spring rear end has one again Position support；Have between spacing back-up ring, resetting shaft, reset cradle and excessively stream valve and fill the hole that gas perhaps passes through；Resetting shaft can only Moved axially along excessively stream valve；Have outside excessively stream valve for installing the spanner side being connected and fixed；Excessively stream valve lateral surface has one Individual stepped hole, there are an O-ring seals in hole, sealing ring is compressed by a plain cushion, there is a back-moving spring, spring above plain cushion An E shape jump ring is headed on above, and E shape jump rings are stuck in the groove for resetting operating shaft；One reset seat compresses plain cushion by screw thread And limit the upward position of E shape jump rings；Operating shaft one end is resetted to be closely linked with SR；Reset operating shaft lower end There is an inclined-plane, this inclined-plane is in uppermost position in fig-ure under normal circumstances, and the mobile generation of resetting shaft vertically will not be interfered；It is multiple Position button in have non-disc, with the outer non-disc of reset seat formed it is chimeric prevent reset operating shaft rotation.Under normal circumstances, steel ball On spacing back-up ring inner face, air-flow flows through the hole of spacing back-up ring end face, through the gap between steel ball and spacing back-up ring inner face, Again through O-ring seals and resetting shaft, the hole of reset cradle, circulated from the other end of excessively stream valve along gas circuit；Work as gas flow After preset value, steel ball is pressed on O-ring seals position under air-flow drive and realizes that gas circuit closes cut-out automatically, press against simultaneously Resetting shaft moves right；It is pressed when resetting operating shaft, its inclined-plane can limit the right end position of resetting shaft, and ensure that steel ball can not It is adjacent to O-ring seals, steel ball can be rolled into the inner face of spacing back-up ring under axial thrust effect caused by deadweight and back pressure spring Upper formed resets.

Beneficial effect

Due to being close to the sealing structure of O-ring seals using steel ball, sealing is more effective, once excessively stream closing will not shape Into leakage.This has important reality to anticipate for preventing and weakening to greatest extent the loss of low pressure imflammable gas security incident Justice.

Brief description of the drawings

The utility model is described in further detail below in conjunction with the accompanying drawings

Accompanying drawing 1 is a kind of low-pressure gas pipe road excess flow valve schematic diagram provided by the utility model

Accompanying drawing 2 is the example schematic that the utility model is installed on pressure regulator outlet

In accompanying drawing, 1, excessively stream valve；2nd, reset cradle；3rd, O-ring seals；4th, resetting shaft；5th, O-ring seals；6th, back pressure Spring；7th, steel ball；8th, spacing back-up ring；9th, O-ring seals；10th, plain washer；11st, operating shaft is resetted；12nd, E shapes snap ring；13rd, reset Seat；14th, back-moving spring；15th, SR；16th, pressure regulator；17th, a kind of low-pressure gas pipe road excess flow valve；18th, flexible pipe.

Embodiment：

(as shown in drawings) a kind of low-pressure gas pipe road excess flow valve provided by the utility model；It can individually be fixedly mounted Or depend on other parts in pipeline and be fixedly mounted, for example it is directly anchored to pressure regulator (16) outlet；A kind of low-pressure gas pipeline Excess flow valve includes the parts such as excessively stream valve (1), steel ball (7) and O-ring seals (5)；Excessively stream valve (1) is close to steel ball (7) one end It is outside to realize that fixed and sealing is installed in connection by the additional O-ring seals (3) of a screw thread；Excessively stream valve is built with one Spacing back-up ring (8), a steel ball (7), an O-ring seals (5), spacing back-up ring (8) are close to O shapes for spacing to steel ball (7) Seal (5) positions；Followed by there is a resetting shaft (4), a back pressure spring (6) is pressed against, back pressure spring (6) rear end has one Reset cradle (2)；Have between spacing back-up ring (8), resetting shaft (4), reset cradle (2) and excessively stream valve (1) and fill gas perhaps and pass through Hole；Resetting shaft (4) can only move axially along excessively stream valve (1)；Excessively stream valve (1) lateral surface has to be connected and fixed for installation Spanner side；Excessively stream valve (1) lateral surface has a stepped hole, there is an O-ring seals (9) in hole, and sealing ring is put down by one Packing ring (10) compresses, and plain washer (10) has a back-moving spring (14) above, and back-moving spring (14) heads on an E shape jump ring above (12), E shapes jump ring card (12) is in the groove for resetting operating shaft (11)；One reset seat (13) compresses plain washer by screw thread (10) and the upward position of E shapes jump ring (12) is limited；Operating shaft (11) one end is resetted to combine closely one with SR (15) Rise；Resetting operating shaft (11) lower end has an inclined-plane, and this inclined-plane is in uppermost position in fig-ure under normal circumstances, will not be to resetting shaft (4) mobile generation interference vertically；There is non-disc in SR (15), formed with the outer non-disc of reset seat (13) chimeric Prevent that resetting operating shaft (11) rotates.Under normal circumstances, steel ball (7) is on spacing back-up ring (8) inner face, and air-flow flows through limiting block The hole of (8) end face is enclosed, through the gap between steel ball (7) and spacing back-up ring (8) inner face, then through O-ring seals (5) and resetting shaft (4), the hole of reset cradle (2), circulated from the other end of excessively stream valve (1) along gas circuit；After gas flow exceedes preset value, Steel ball (7) is pressed on O-ring seals (5) under air-flow drive and realizes that gas circuit closes cut-out automatically, while press against resetting shaft (4) Move right；It is pressed when resetting operating shaft (11), its inclined-plane can limit the right end position of resetting shaft (4), and ensure steel ball (7) It can not be adjacent to O-ring seals (5), steel ball can be rolled into spacing under axial thrust effect caused by deadweight and back pressure spring (6) Formed and resetted on the inner face of back-up ring (8).

Claims (1)

1. A kind of 1. low-pressure gas pipe road excess flow valve；It is individually fixedly mounted or depended on other parts in pipeline and is fixedly mounted；It Including excessively stream valve (1), steel ball (7) and O-ring seals (5)；Excessively stream valve (1) has a spiral shell outside steel ball (7) one end The additional O-ring seals (3) of line；Excessively stream valve is built with a spacing back-up ring (8), a steel ball (7), an O shapes sealing Enclose (5)；Followed by there is a resetting shaft (4), a back pressure spring (6) is pressed against, back pressure spring (6) rear end has one to reset branch Frame (2)；Have between spacing back-up ring (8), resetting shaft (4), reset cradle (2) and excessively stream valve (1) and fill the hole slot that gas perhaps passes through； Excessively stream valve (1) lateral surface has spanner side；Excessively stream valve (1) lateral surface has a stepped hole, there is an O-ring seals in hole (9), compressed by a plain washer (10), plain washer (10) has a back-moving spring (14) above, and back-moving spring (14) has above One E shapes jump ring (12), E shapes jump ring (12) are stuck in the groove for resetting operating shaft (11)；One reset seat (13) passes through spiral shell Line compresses plain washer (10) and limits the upward position of E shapes jump ring (12)；Reset operating shaft (11) one end and SR (15) It is closely linked；Resetting operating shaft (11) lower end has an inclined-plane, and this inclined-plane is in uppermost position in fig-ure under normal circumstances, no The mobile generation of resetting shaft (4) vertically can be interfered；There is non-disc in SR (15), it is outer not rounded with reset seat (13) Face, which forms to be fitted together to, prevents that resetting operating shaft (11) rotates；Under normal circumstances, steel ball (7) is on spacing back-up ring (8) inner face, air-flow The hole of spacing back-up ring (8) end face is flowed through, through the gap between steel ball (7) and spacing back-up ring (8) inner face, then through O-ring seals (5) and resetting shaft (4), the hole of reset cradle (2), circulated from the other end of excessively stream valve (1) along gas circuit；When gas flow surpasses After crossing preset value, steel ball (7) is pressed on O-ring seals (5) under air-flow drive and realizes that gas circuit closes cut-out automatically, presses simultaneously Resetting shaft (4) to move right；It is pressed when resetting operating shaft (11), its inclined-plane can limit the right end position of resetting shaft (4), and Ensure that steel ball (7) can not be adjacent to O-ring seals (5), steel ball is under axial thrust effect caused by deadweight and back pressure spring (6) It can be rolled into be formed on the inner face of spacing back-up ring (8) and reset.