CN201526725U

CN201526725U - Pneumatic control valve

Info

Publication number: CN201526725U
Application number: CN200920256912XU
Authority: CN
Inventors: 梅益君; 马如中
Original assignee: DONGTAI CITY DONG FANG MARINE FITTING Co Ltd
Current assignee: DONGTAI CITY DONG FANG MARINE FITTING Co Ltd
Priority date: 2009-11-10
Filing date: 2009-11-10
Publication date: 2010-07-14
Anticipated expiration: 2019-11-10

Abstract

The utility model discloses a pneumatic control valve, which comprises a valve seat, a valve body, a valve disc and a return spring, wherein the valve seat is fixedly connected with the valve body and a valve bonnet; the valve bonnet is sleeved on the valve body; the center of the valve body is provided with a through hole which is coaxial with an inner bore of the valve bonnet; a plunger is arranged inside the valve bonnet; the upper portion of the plunger is connected with the inner bore of the valve bonnet in a sealed manner; the lower portion of the plunger penetrates through the through hole of the valve body and extends downwards; the lower portion of the plunger is connected with the through hole of the valve body in a sealed manner; the bottom end of the plunger is fixedly connected with the valve disc; and the return spring is disposed between the plunger and the valve bonnet. The pneumatic control valve has the advantages of reasonable structure, good sealing performance and long service life.

Description

Pneumatic control valve

Technical field

The utility model relates to a kind of control valve, refers in particular to the pneumatic control valve that applies in the industrial control system.

Background technique

In industrial control system, as extensively using valve element in the facilities such as oil, chemical industry, environmental protection equipment, water-treating equipment various actuators are controlled, to realize the action of expection, this control mode has obtained application more and more widely aborning.The valve that is adopted in traditional automatic control system mainly is divided three classes; One class is that solenoid valve, two classes are that mortor operated valve, three classes are pneumatic valves.Big because of general solenoid valve power, energy consumption is high, inrush current is big, to component and system loading Capability Requirement height, and be easy to generate noise, hydraulic pressure accommodation little (occurring closing under the high pressure conditions phenomenon that hysteresis maybe can not be closed easily), dangerous, the phenomenon of easily burning coil; Again because mortor operated valve relies on electricity to drive, have under the occasion of requirement of explosion proof inapplicable, and its complex structure, the maintenance cost height, speed of response is slow.The above this valve of two types has limited it to a certain extent and has used more widely because of himself defective.Pneumatic valve is power with the pressure gas source, safe and reliable, safeguard simple, control powerful, response is sensitive.Therefore, pneumatic valve obtains using more widely in the control system that with valve class part is control unit with the advantage of himself.

It mainly comprises valve body, valve disc, Returnning spring, push rod and with the actuator of pressurized air as power source, this actuator has usually present pneumatic valve: piston, bellows, diaphragm etc. flows; Pressurized air is from valve body epicoele compress bellows or promote piston during work, and piston or bellows then promote valve disc, and with throttle down, when pressurized air during from the emptying of valve body epicoele, then valve disc relies on the effect of Returnning spring to open valve.Still there is following defective respectively in such pneumatic valve in actual application: on the one hand, with the pneumatic valve of piston as the valve disc actuator, because of only relying on piston, the to-and-fro motion of piston in valve body lead, and the seal ring that is installed on the piston greatly reduces the area of contact of piston and valve body, the guidance quality variation of piston in valve body then, piston can take place crooked in movement process, and can gnaw the erosion phenomenon between valve interior wall, this has just directly aggravated the wearing and tearing of seal ring, has reduced the working life of seal ring; Make the pneumatic valve of actuator with the diaphragm that flows, the main component of the mobile diaphragm of cause is a rubber, it can take place tired behind do action repeatedly and produce elastic failure, and diaphragm is after bearing the active force of pressurized air to it for a long time, rubber is easily aging, influenced the usability of diaphragm, thereby shortened the working life of valve; With the pneumatic valve of bellows as the valve disc actuator, because of bellows preparation process more complicated, and the selection of material requirement endurance metal, the valve rod shake causes valve disc poorly sealed, easily produces seepage; On the other hand, the above-mentioned pneumatic valve of doing actuator respectively with piston, bellows or mobile diaphragm, its Returnning spring all is arranged at the valve disc below, directly contact with controlled medium, burn into easily takes place and gets rusty and cause the unable or deficiency that resets of spring reset in spring, valve disc is not closed completely, produces the defective of controlled dielectric leakage.

The model utility content

Technical problem to be solved in the utility model provides a kind of long service life, the pneumatic control valve of good seal performance.

In order to solve the problems of the technologies described above, pneumatic control valve of the present utility model comprises valve seat, valve body, valve disc, Returnning spring, be fixedly connected with valve body and valve gap on the described valve seat, valve gap is socketed on the valve body, the valve body center position is provided with through hole, this through hole and valve gap endoporus coaxial line, also be provided with piston in the valve gap, this piston top and valve gap endoporus are tightly connected, the piston bottom is passed valve hole and is extended downwards, piston bottom and valve hole are tightly connected, the piston bottom end valve disc that has been permanently connected, and described Returnning spring is arranged between piston and the valve gap.

After adopting said structure, because valve body is arranged in the valve gap, valve body all is connected with valve seat regularly with valve gap, the valve body center position is provided with and valve gap endoporus coaxial line through hole, be provided with top in the valve gap and the valve gap endoporus is tightly connected, the piston that the bottom is passed valve hole and extended downwards, piston bottom and valve hole are tightly connected.When then having realized piston reciprocates, by piston and valve gap and piston and secondary guiding of valve body two place's cylinders, the guidance quality of piston integral body strengthens, overcome original piston only cylinder is secondary in movement process and led, easily take place crooked, easy and valve interior wall is gnawed the defective of erosion, be installed on the seal ring in piston top and the valve body inner bore like this, when pistons work, just can keep balance preferably, not only slow down the wearing and tearing of seal ring, had good sealability, also prolonged the working life of seal ring, promptly prolong the working life of pneumatic valve, and guaranteed the sealability of pneumatic valve.The set-up mode of this pneumatic control valve, also overcome simultaneously with the diaphragm that flows and done actuator, and the existing defective of pneumatic valve of doing actuator with bellows, with the advantage that its good sealability, working life obtains prolonging, can substitute fully with the diaphragm that flows and reach the pneumatic valve of doing actuator with bellows.

Again because Returnning spring is arranged between piston and the valve gap, this has just realized Returnning spring and controlled medium are isolated, make it directly not contact controlled medium, avoided originally Returnning spring being arranged at the valve disc below, directly contact with controlled medium, spring generation burn into is got rusty and cause Returnning spring to reset unable or the deficiency that resets, valve disc is not closed completely, produce the defective of controlled dielectric leakage, played good sealing effect.

A preferred implementation of the present utility model is; piston is provided with pointer; this pointer one end and piston are fixedly connected; the other end passes valve gap and stretches out; by the amount of movement of the relative valve gap of this pointer, the amount of movement that can observe out piston intuitively is the open amount of valve disc, is convenient to the stroke of piston is control effectively; to avoid operating air pressure excessive and make the Returnning spring doubling-up, influence working life of spring, realized protection to Returnning spring.

Description of drawings

Below in conjunction with the drawings and specific embodiments pneumatic control valve of the present utility model is described further.

Fig. 1 is the work structuring schematic representation of a kind of embodiment of the utility model pneumatic control valve.

Among the figure, 1-valve seat, 2-end-face seal ring, 3-inlet hole, 4-valve gap, 5-pointer, 6-Returnning spring, 7-piston, 8-O RunddichtringO, 9-valve body, 10-screw, 11-valve disc, 12-air outlet hole.

Embodiment

In the pneumatic control valve shown in the figure; valve gap 4 is pressing the valve body 9 that center position is provided with through hole; two O RunddichtringOs 8 are installed in the through hole of valve body 9; on the valve body 9 top excircles O RunddichtringO 8 is installed; can realize the sealing of 4 of valve body 9 and valve gaps by this O RunddichtringO 8; valve gap 4 under the effect of lock screw with valve seat 1 Joint; between valve body 9 and the valve seat 1 end-face seal ring 2 is installed; can realize the sealing of 9 of valve seat 1 and valve bodies by this end-face seal ring 2; piston 7 profiles are the multidiameter shaft shape; match with valve gap 4 through holes and be connected in piston 7 big footpaths; and on piston 7 big footpath excircles, two O RunddichtringOs 8 are installed; can realize the sealing of 7 in valve gap 4 and piston by two the O RunddichtringOs 8 in this place; piston 7 paths partly pass valve body 9 through holes; and match with valve body 9 through holes and to be connected; be installed in two O RunddichtringOs 8 in valve body 9 through holes; played seal action to 7 in valve body 9 and piston; axle head in piston 7 paths part; by screw 10 valve disc 11 is installed; by above setting; then formed piston 7 and had in the course of the work that two place cylinders are secondary to lead; increased the balance of work; guaranteed the working life of O RunddichtringO 8 better; played good sealing effect; the end face that piston 7 large-diameter portions divide is provided with the stepped shaft counterbore; Returnning spring 6 is installed in the shoulder hole; Returnning spring 6 upper ends are pressing closer valve gap 4; pointer 5 one ends and valve body 9 fix; and it passes through hole default on the valve gap 4 along Returnning spring 6 direction of axis line; and extend upward valve gap 4 tops; the amount of movement that can observe out piston 7 intuitively by this pointer 5 is the open amount of valve disc 11; be convenient to the stroke of piston 7 is control effectively; avoided that operating air pressure is excessive to cause Returnning spring 6 doubling-up; the defective that reduces the working life of Returnning spring 6 has played the protective action to Returnning spring 6.Also show the flow direction of controlled medium among the figure.

During use, tracheae is connected is arranged on the inlet hole of locating between piston 7 and the valve body 9 on the valve gap 43, externally under the pressurized air effect that source of the gas provides, piston 7 is pushed, be in the gas in piston 7 top valve gaps 4 inner chambers, discharge by an air outlet hole 12 that is arranged on valve gap 4 end faces, thereby valve disc 11 is separated with valve seat 1, realized unlatching, made the medium circulation that originally is in cut-off state, when needs end medium valve, when not allowing its circulation, then cut off source of the gas, the effect that relies on Returnning spring 6 has realized closing valve with valve disc 11 and valve seat 1 closure.

Above-mentioned some preferred implementations of only enumerating the utility model pneumatic control valve, but be not limited to this, under the situation of the utility model basic principle, also can do some conversion and improvement.For example, reach piston 7 large-diameter portions in valve body 9 through holes and divide the O RunddichtringO of installing on the excircle 8 not only to be limited to two, also can be one or more; O RunddichtringO 8 on same valve body 9 excircles not only is limited to one, also can be many; The air outlet hole 12 that is arranged on valve gap 4 end faces also not only is limited to one, also can be many, and so on.So long as valve seat is provided with valve gap; valve body is provided with through hole, and piston is set to stepped, and piston has the many places sliding pair to lead when work; Returnning spring is arranged on structure between piston and the valve gap, all is considered as falling into protection domain of the present utility model.

Claims

1. pneumatic control valve, comprise valve seat (1), valve body (9), valve disc (11), Returnning spring (6), it is characterized in that: be fixedly connected with valve body (9) and valve gap (4) on the described valve seat (1), valve gap (4) is socketed on the valve body (9), valve body (9) center position is provided with through hole, this through hole and valve gap (4) endoporus coaxial line, also be provided with piston (7) in the valve gap (4), this piston (7) top and valve gap (4) endoporus are tightly connected, piston (7) bottom is passed valve body (9) through hole and is extended downwards, piston (7) bottom and valve body (9) through hole are tightly connected, piston (7) the bottom valve disc (11) that has been permanently connected, described Returnning spring (6) is arranged between piston (7) and the valve gap (4).

2. pneumatic control valve according to claim 1 is characterized in that: the valve gap (4) between piston (7) and the valve body (9) is provided with inlet hole (3), and the top of this valve gap (4) also is provided with air outlet hole (12).

3. pneumatic control valve according to claim 1, it is characterized in that: piston (7) part that matches with valve gap (4) is provided with O RunddichtringO (8), be provided with O RunddichtringO (8) in valve body (9) through hole that matches with piston (7), valve body (9) periphery that matches with valve gap (4) is provided with O RunddichtringO (8).

4. pneumatic control valve according to claim 1 is characterized in that: be provided with end-face seal ring (2) between described valve body (9) and the valve seat (1).

5. pneumatic control valve according to claim 1 is characterized in that: described piston (7) is provided with pointer (5), and these pointer (5) one ends and piston (7) are fixedly connected, and the other end passes valve gap (4) and stretches out.