CN2599338Y

CN2599338Y - Normally closed pneuamtic piston cut-off valve

Info

Publication number: CN2599338Y
Application number: CNU032393350U
Authority: CN
Inventors: 赵国大
Original assignee: Individual
Current assignee: Individual
Priority date: 2003-02-24
Filing date: 2003-02-24
Publication date: 2004-01-14
Anticipated expiration: 2013-02-24

Abstract

A normal close type pneumatic piston cut-off valve with simple structure, easy maintenance and long service life. One end of the valve (1) is provided with an air inlet (2) and the other end is provided with an air outlet (9); a gasket (12) is fixed to the lower end of the valve stem (10). The utility model is characterized in that the valve (1) is connected with a cylinder (8); the upper end of the cylinder (8) is connected with a cylinder cover (3); the valve stem (10) goes through the lower wall of the cylinder (8); the upper part of the valve stem (10) is positioned in the cylinder (8) and the lower part is positioned in the valve (1); the upper end of the valve stem (10) is connected with a piston (6) which is positioned in the cylinder (8); a spring (5) supports the piston (6); the cylinder (8) is opened with an air control inlet (7) which is positioned below the piston (6); the upper end of the valve stem (10) is connected with a travel indicator rod (4) which goes through the cylinder cover (3). The utility model is suitable to be the on/off valve of the gas transmission pipe.

Description

Normally-closed Type Pneumatic Piston Cut Off Valve

Technical field

The utility model belongs to the valve of closure or openness fluid passage.

Background technique

The used a kind of pneumatic valve of conveyance fluid in the prior art (gas) is the film type cut-off valve, produce pressure by controlling gas input cylinder body, make diaphragm deformation, pressure spring and promote piston motion is simultaneously realized the unlatching of valve or is closed (comprising normal close type and open type); In the gas of removing controls when input,, spring reset makes valve closing or unlatching, and that realizes thus that fluid (gas) carries opens or end.This air bladder cut-off valve component are more, except valve body, valve seat, valve rod, diaphragm seal, piston, cylinder body, spring and necessary O type circle, screw, nut etc., also be provided with parts such as diaphragm, seal sleeve, sealing astragal, lining, cylinder body also comprises upper cylinder cover and following cylinder cap, its complex structure, the cost height, maintenance is difficulty; And also there are many defectives in this valve, comprise: the elastomer diaphragm cracky, diaphragm seal as closure valve is shorter working life, when causing pilot pressure unstable when the system pressure shakiness, spring bears alternating stress, easily produces tired and damages, and the lifting travel of piston, valve rod need be adjusted in the use, adjust when inaccurate, influence the working life of valve.

Summary of the invention

Technical problem to be solved in the utility model is the deficiency that overcomes air bladder cut-off valve in the described prior art, provides structure fairly simple, and volume is less, required component are less, technology capability is good, and cost is low relatively, a kind of Normally-closed Type Pneumatic Piston Cut Off Valve of long service life.

For addressing the above problem, the technological scheme that the utility model Normally-closed Type Pneumatic Piston Cut Off Valve adopts is to be provided with suction port at valve body one end, the other end is provided with the air outlet, the valve rod lower end is fixed with seal washer, its special way is to be associated with cylinder on the valve body, the cylinder upper end is associated with cylinder head, valve rod passes the cylinder lower wall, valve rod top is positioned at cylinder, the bottom is positioned at valve body, the valve rod upper end is associated with piston and is positioned at cylinder, and the top is provided with spring above the piston, offers the import of control gas on the cylinder and is positioned at the piston below.

Described valve rod upper end can be connected with the stroke indicating arm and pass cylinder head.

Promptly not when cylinder input control gas, under spring action, piston, valve rod and seal washer that the lower end joins thereof are depressed under the normality, and valve closing is blocked suction port and air outlet institute communication channel; When gas was controlled in the cylinder input, piston moved simultaneously together with valve rod and seal washer that the lower end joins thereof by the import of control gas, and valve opening is opened suction port and air outlet institute communication channel.During the gas of removing controls input, spring reset, valve closing returns to normal.

Valve rod upper end connect the stroke indicating arm and pass cylinder head, can indicate the upper and lower motion of valve rod and seal washer that the lower end joins thereof, show the open and close situation of valve.

The utility model is owing to be associated with cylinder on valve body, the valve rod upper end is associated with piston and is positioned at cylinder, the top is provided with spring above the piston, offer the import of control gas on the cylinder and be positioned at the piston below, control gas is done the switching of input/elimination, just can realize the open and close of valve, and can indicate unlatching, close situation, so compare with existing intimate air bladder cut-off valve, the required component of this valve greatly reduce, structure is greatly simplified, and the volume of valve can dwindle, and manufacture cost reduces, and the technology capability of valve is good, easy to maintenance, the bulk life time of valve also can prolong.The valve rod upper end is connected with the utility model of stroke indicating arm, can open and close situation by indicating valve.

Description of drawings

Fig. 1 is the utility model structural representation.

Embodiment

The Normally-closed Type Pneumatic Piston Cut Off Valve of present embodiment, valve body 1 one ends are provided with suction port 2, the other end is provided with air outlet 9, valve rod 10 lower ends are fixed with seal washer 12, be provided with packing ring 11 above the seal washer 12, be associated with cylinder 8 on the valve body 1, cylinder 8 upper ends are associated with cylinder head 3, valve rod 10 passes cylinder 8 lower walls, and valve rod 10 tops are positioned at cylinder 8, and the bottom is positioned at valve body 1, valve rod 10 upper ends are associated with piston 6 and are positioned at cylinder 8, the top is provided with spring 5 above the piston 6, offers control gas import 7 on the cylinder 8 and is positioned at piston 6 belows, and valve rod 10 upper ends are connected with stroke indicating arm 4 and pass cylinder head 3.

Claims

1, Normally-closed Type Pneumatic Piston Cut Off Valve, valve body (1) one end is provided with suction port (2), the other end is provided with air outlet (9), valve rod (10) lower end is fixed with seal washer (12), it is characterized in that being associated with on the valve body (1) cylinder (8), cylinder (8) upper end is associated with cylinder head (3), valve rod (10) passes cylinder (8) lower wall, valve rod (10) top is positioned at cylinder (8), the bottom is positioned at valve body (1), valve rod (10) upper end is associated with piston (6) and is positioned at cylinder (8), and the top is provided with spring (5) above the piston (6), offers control gas import (7) on the cylinder (8) and is positioned at piston (6) below.

2, Normally-closed Type Pneumatic Piston Cut Off Valve as claimed in claim 1 is characterized in that valve rod (10) upper end is connected with stroke indicating arm (4) and passes cylinder head (3).