CN200989449Y

CN200989449Y - Pneumatic stop valve

Info

Publication number: CN200989449Y
Application number: CN 200620046479
Authority: CN
Inventors: 李建和
Original assignee: SHANGHAI MINGZHU VALVE MANUFACTURING Co Ltd
Current assignee: MINGZHU VALVE GROUP CO., LTD.
Priority date: 2006-09-29
Filing date: 2006-09-29
Publication date: 2007-12-12
Anticipated expiration: 2016-09-29

Abstract

A pneumatic cut-off valve contains a pneumatic device, a valve body, a valve clack, a valve seat, a valve stem, filler, a filler internal-lid, a valve cover and a stent that connects the pneumatic device. The utility model is characterized in that: the valve clack is positioned at the lower part of the valve seat and is connected with the valve stem that is connected with the motion piston of the pneumatic device. The valve stem is bolted by the connector that is positioned serially in the central hole at the lower part of the valve clack; the lower part of the valve clack is telescoped with a sealing cap and an O-ring is arranged between the sealing cap and the valve clack. For adopting the structure that the valve clack is positioned at the lower part of the valve seat, no matter in the opening or closing process the utility model can effectively makes use of the pressure of the conveying fluid and realizes quick opening and closing of the valve when the valve clack has not finished the design stroke in the pneumatic piston.

Description

A kind of pneumatic cut-off valve

Technical field

The utility model relates to a kind of pneumatic cut-off valve, belongs to pneumatic stopping valve.

Background technique

Cut-off valve is the most frequently used a kind of type valve that ends, and all is that the flap that will be connected with valve rod is located on the valve seat in common design proposal, is made of the sealing surface that cuts off FLUID TRANSPORTATION the junction plane between flap and the valve seat.The stop valve sealing configuration of this form, the characteristics of the motion of its fluid are that inflow-rate of water turbine is also increased gradually, have only when rising with valve rod and cover whole strokes, just make the runner by the flap sealing be in full open.The full flow on state; Closing this valve equally, when cutting off FLUID TRANSPORTATION, must treat also that valve rod is descending to cover whole strokes, just can make the flap that is in the valve rod lower end cut off runner.This is a working principle of seeing common cut-off valve usually.If when above-mentioned cut-off valve and Pneumatic actuator are connected to form pneumatic cut-off valve, must treat just can make valve opening after the piston stroking upward that is connected with valve rod is covered the stroke of setting, also have only after descent of piston is covered the stroke of setting simultaneously just can make valve closing.This is undoubtedly a kind of comparatively sorry defective for the fluid feed line of quick unlatching of hope enforcement in the short as far as possible time or quick closedown.

Therefore, how existing pneumatic cut-off valve is innovated, improved, make its full load conducting that reaches flow-passing surface at short notice as far as possible, can when the needs quick closedown, realize the short time quick closedown again simultaneously.This is the demand of certain user during FLUID TRANSPORTATION is used, also is a kind of problem of valve factory.

The model utility content

The purpose of the present utility model: be intended to propose a kind of novel pneumatic cut-off valve, wish that it can realize opening fast in the full sealability of maintaining valve, also can accomplish to close fast.

This pneumatic cut-off valve, by Pneumatic actuator 18, valve body 5, flap 8, valve seat 10, valve rod 11, filler 13, filler inner cap 14, the support 17 of valve gap 16 and connection Pneumatic actuator 18 is formed, it is characterized in that: described flap 8 places the below of valve seat 10, and connects with the valve rod 11 that is connected with moving piston in the Pneumatic actuator 18.

Described valve rod 11 is spirally connected by the link 19 of tandem arrangement in flap 8 lower central holes.

The bottom of described flap 8 is equipped with sealed

cap

6, and 8 of sealing cap 6 and flaps are provided with O-ring seals 7.

This startup cut-off valve according to above technological scheme proposition, owing to adopt the structural type that flap is located at the valve seat bottom, therefore no matter when opening process or closing motion carry out, can both be effectively by the pressure of conveyance fluid, help flap when pneumatic piston does not expose design runlength as yet, just can realize the quick unlatching of valve or close.

Description of drawings

Accompanying drawing is a structural representation of the present utility model.

Among the figure 1, hexagon nut 2, stud 3, bottom 4, pad 5, valve body 6, sealed cap 7, O-ring seals 8, flap 9, contiguous block 10, valve seat 11, valve rod 12, O-ring seals 13, filler 14, Gland 15, interior hexagonal cylinder screw 16, valve gap 17, support 18, Pneumatic actuator

Embodiment

This pneumatic cut-off valve as shown in the figure, it is that this improvement is mainly reflected in to a kind of inventive improvements of existing congenerous pneumatic cut-off valve: flap 8 is placed the below of valve seat 10, and with valve rod 11 connections that are connected with moving piston in the Pneumatic actuator 18; And valve rod 11 is spirally connected by the link 19 of tandem arrangement in flap 8 lower central holes.

Described valve rod 11 is spirally connected by the link 9 of tandem arrangement in flap 8 lower central holes.

The bottom of described flap 8 is equipped with sealed

cap

6, and 8 of sealing cap 6 and flaps are provided with O-ring seals (7).

Take the maximum characteristics of said structure to be: because with on the following pedestal of flap 8 as for valve seat 10, therefore when Open valve, as long as Pneumatic actuator 18 presses down piston and make flap 8 descending by valve rod 11, when in case this flap 8 is lifted off a seat 10 certain intervals, because the pressure effect of overcurrent fluid, will quicken to make these flap 8 disengaging valve seats 10 descending, form flow channels; Even this moment, piston was no longer afterburning descending, this flap 8 is descending opening fast also, allows fluid full load overcurrent.And in case need close this valve the time, because the upwards operation of pneumatic piston, will spur on the valve rod 11 that is connected with flap 8 and carry, this moment is also just because of the pressure effect of overcurrent fluid, when flap 8 runs to certain position, impel flap 8 fast rise, cut off the fluid passage until flap 8 and valve seat 10 driving fits.The upstream fluid of this moment not only helps flap 8 throttle downs, but also because the effect of pressure makes sealing even more ideal.

This working principle that starts cut-off valve is as follows: during valve opening, piston drives valve 11 and moves downwards, when valve rod 11 moves 45mm downwards, contiguous block 9 on the valve rod touches sealed cap 6, sealed cap drives flap 8 and overcomes medium-tight and make every effort to promote sealing pair is broken away from, in case sealing pair separates to some extent, medium power will be immediately opened the runner conducting fully with flap moment.

During valve closing, under the effect of spring force, valve rod 11 rises together with flap 8, and after the sealing pair combination, medium power can make sealing force further increase.

Owing to adopt valve rod 11 and flap 8 to flexibly connect, be convenient to remedy the cumulative error in processing, assembly process, regulate coincideing of sealing surface automatically, make sealing more reliable.

In the opening-closing process of this cut-off valve, piston force is mainly used to overcome the frictional force that elastic force and filler produced of spring; Spring produces advocates to be used for to overcome the frictional force that filler and piston cause and the weight of flap assembly; So its keying moment is very little.

This cut-off valve is air to open, Normally closed type valve, closes when promptly losing gas.This pneumatic cut-off valve can realize that distant control or central microcomputer chamber control automatically.

Claims

1, a kind of pneumatic cut-off valve, by Pneumatic actuator (18), valve body (5), flap (8), valve seat (10), valve rod (11), filler (13), filler inner cap (14), the support (17) of valve gap (16) and connection Pneumatic actuator (18) is formed, it is characterized in that: described flap (8) places the below of valve seat (10), and is connected with the valve rod (11) that is connected with moving piston in the Pneumatic actuator (18).

2, a kind of pneumatic cut-off valve as claimed in claim 1 is characterized in that: described valve rod (11) is spirally connected by the link (9) of tandem arrangement in flap (8) lower central hole.

3, a kind of pneumatic cut-off valve as claimed in claim 1 is characterized in that: the bottom of described flap (8) is equipped with sealed cap (6), is provided with O-ring seals (7) between sealing cap (6) and flap (8).