CN102563088A

CN102563088A - Reverse sealing structure of emergency cut-off valve for gas

Info

Publication number: CN102563088A
Application number: CN2010106104190A
Authority: CN
Inventors: 海明璋; 高健中
Original assignee: YANSHAN INDUSTRY GAS BURNING DEVICE Co Ltd BEIJING
Current assignee: YANSHAN INDUSTRY GAS BURNING DEVICE Co Ltd BEIJING
Priority date: 2010-12-29
Filing date: 2010-12-29
Publication date: 2012-07-11

Abstract

The invention relates to a reverse sealing structure of an emergency cut-off valve for gas, in particular to an emergency cut-off valve structure for gas and with a large working pressure range. The reverse sealing structure of the emergency cut-off valve for gas is characterized in that the closing direction of a valve is the same with the F1 direction of rod pulling force, and the pressure difference of the inside and the outside of a valve body is utilized to assist to close the valve. The reverse sealing structure of the emergency cut-off valve for gas has the advantages that 1 the structure is simple, and the cost is reduced slightly compared with an existing commonly-used structure; 2 the requirements can be met without the large spring force P, and the design difficulty is reduced; and 3 due to the fact that the dependence of a spring to provided spring force is reduced, the working pressure range of the valve is large.

Description

A kind of reverse sealing configuration of gas emergency cut-off valve

Technical field

The present invention relates to a kind of reverse sealing configuration of gas emergency cut-off valve, the gas emergency cut-off valve arrangement that particularly a kind of range of working pressure is bigger (seeing Fig. 1, Fig. 2).

Background technique

The sealing configuration that present domestic gas emergency cut-off valve generally adopts all is the (see figure 3) that top-down direction is closed, and in the cut-off valve working state, can have pressure difference inside and outside the valve body, so valve rod receives a dead man power F outside valve body ₁, because reasons in structure, its spring force P should be greater than dead man power F ₁With frictional force f with, its opening force F is spring force P, frictional force f and valve seat pressure F ₂With; Therefore its ubiquity is when range of working pressure is big; Its spring design is the problem of difficulty; Though some producer has released the structure of through rod type or axial flow and has solved this problem, exist the product manufacturing complicated, the big and cost of volume is more high to be unfavorable for the factor of controlling cost.

Summary of the invention

In order to overcome the deficiency on the existing gas emergency cut-off valve arrangement, the present invention proposes a kind of structure, to solve the problem that spring is difficult for design.

The technical solution adopted for the present invention to solve the technical problems is:

A kind of reverse sealing configuration of gas emergency cut-off valve is characterized in that: valve closing direction and dead man power F ₁Direction is identical, utilizes the inside and outside pressure difference of valve body to reach the purpose of closing assisted valve.

Basic thought of the present invention is: when the gas emergency cut-off valve is in opening state, can have pressure difference inside and outside the valve body, so valve rod receives a dead man power F outside valve body ₁, the power F of throttle down _Close=dead man power F ₁+ spring force P-frictional force f; When the gas emergency cut-off valve is in closed condition, the power F of Open valve _Open=flap pressure+spring force P+ frictional force f.

By on can know that structural advantages of the present invention is:

1, simple in structure, to compare with the structure that generally adopts at present, cost slightly reduces.

2, spring force P need not design to such an extent that just can meet the demands very greatly, has reduced design difficulty.

3, owing to the dependence of the spring force that has reduced spring is provided, the range of working pressure of this valve is bigger.

Description of drawings:

The reverse sealing configuration of Fig. 1 gas emergency cut-off valve (opening state)

The reverse sealing configuration of Fig. 2 gas emergency cut-off valve (closed condition)

The sealing configuration that the present domestic gas emergency cut-off valve of Fig. 3 generally adopts

Reference character: 1-cuts off controller, 2-valve gap, 3-valve rod, 4-valve seat, 5-flap, 6-spring, 7-valve body

Embodiment:

Enforcement is referring to Fig. 1, Fig. 2, and this reverse sealing configuration comprises the cut-out controller that control valve is closed; Play the valve gap of support and leading role; Be used to the valve rod that connects and control, the valve seat of sealing usefulness is used for covering tight valve seat to cut off the flap of pipeline circulated gases; For the valve rod flap provides the spring of a determined power, play the valve body of framework effect.

Working procedure of the present invention:

Valve is in pipeline, and when being in opening state (Fig. 1), valve rod receives the dead man power that makes progress that produces because of the valve body inside and outside differential pressure, elastic force that spring makes progress and the downward spacing power of cut-out controller.Receive that when cutting off controller shutoff signal begins to move the spacing power to valve rod that removed; Valve rod moves upward under the effect of dead man power and elastic force; Flap to the main valve seat motion, contacts with main valve seat until flap under the drive of valve rod, accomplishes the isolating seal in chamber, valve front and back; Valve is accomplished and is cut off action, is in closed condition (Fig. 2).

Valve is in pipeline, and when being in closed condition (Fig. 2), valve rod receives the flap pressure that makes progress that produces because of chamber, front and back pressure reduction, the elastic force that spring makes progress.When pressing down valve rod, overcome flap pressure and elastic force, flap separates with main valve seat under valve rod promotes; Again block valve rod up to cutting off controller; And the spacing power that valve rod has been applied, balance the effect of dead man power and elastic force, accomplish the connection in chamber before and after the valve; Valve is accomplished breakdown action, is in opening state (Fig. 1).

Claims

1. a kind of reverse sealing configuration of gas emergency cut-off valve; Utilize the inside and outside pressure difference of valve body to reach the purpose of closing assisted valve; It has comprised the valve rod that connects with control action, plays the valve gap of support and guides stem effect, and the spring of a determined power is provided for the valve rod flap; The valve seat that seals, the cut-out controller that control valve closes that is used for of apportion valve seat both sides covers tight valve seat to cut off the flap of pipeline circulated gases with being used to.