CN2291540Y

CN2291540Y - Valve clack device

Info

Publication number: CN2291540Y
Application number: CN 97206973
Authority: CN
Inventors: 郭建国; 杨新民; 管雪元
Original assignee: Individual
Current assignee: Individual
Priority date: 1997-01-15
Filing date: 1997-01-15
Publication date: 1998-09-16
Anticipated expiration: 2007-01-15

Abstract

The utility model discloses a valve clack device for a valve, which comprises a pressure guide hole 8, a pressure relief hole 9, and a main valve clack 4. A main valve of the valve is composed of the main valve clack 4 and a valve seat 2; a priority valve is composed of the pressure guide hole 8 and the bottom end of a valve rod 3; the valve rod 3 is provided with a starting device 6 which can drive the main valve clack 4; when the valve is opened, the priority valve whose inside nominal diameter is comparatively small is opened first, and moment when the priority valve is opened, the pressure relief hole 9 and the pressure guide hole 8 are communicated with each other; the axial force of medium to the valve rod 3 is reduced, and by the drive of the starting device, the main valve can be started thereby. The utility model is characterized in that the opening and closing force moment of the valve is comparatively small, and the medium can flow in two ways.

Description

The Valve clack device of valve

The utility model relates to a kind of Valve clack device of valve, relates in particular to the Valve clack device that uses under a kind of high-pressure situations.

At present, be widely used in mostly in the valve in fields such as petrochemical industry, coal gas, water be dim using single flap, " the disclosed overwhelming majority's of valve design handbook (China Machine Press publishes the second impression in October nineteen ninety-five in December, 1992) valve mechanism form as the Lu Yuanquan chief editor.Because the flap that this and valve rod is fixed together is when closing, total axial force of valve rod comprise from the sealing load on the valve seat, act between medium power, valve rod and the stuffing box packing on the flap frictional force stem shaft to component, therefore total axial force of valve rod is very big, and then make that the moment that starts valve is very big, the opplied moment of rotation hand wheel increases, and uses harder; In addition, also can increase the screw thread that is connected between stuffing box packing, valve body and the valve gap or the wearing and tearing of flange and valve seat and flap surface of contact, reduce the working life of these sealing part, thereby made valve be very easy to seepage.Equally (China Machine Press publishes in December, 1992 at Lu Yuanquan chief editor's " valve design handbook) ", the second impression in October nineteen ninety-five) the 55th page discloses a kind of high-pressure stop valve with pilot valve, this high-pressure stop valve is when flap design, traditional simple flap form improvement is become combination valve lobe form, promptly near the periphery of valve seat one end one main valve clack is installed at valve rod, main valve clack is having a breach near the valve seat place, and stem shaft to bit point one pilot valve is installed, pilot valve contacts with the breach sealing of main valve clack when valve rod is closed, when valve rod is opened, pilot valve is opened earlier, to main valve clack, just can open main valve during pressure balance, this valve has used the pilot valve form, like this when Open valve, the moment of rotation hand wheel reduces to some extent, but this valve also exists deficiency, can only guarantee that promptly the running torque of medium when pilot valve following flows to the top of main valve reduces, and the minimizing of running torque can not realize that medium flows to the below of pilot valve from the top of main valve the time.

The purpose of this utility model is to overcome the defective that the Valve clack device of above-mentioned valve exists and a kind of Valve clack device that all can guarantee the valve that starting torque reduces under medium two-way flow situation is provided.

The purpose of this utility model is achieved through the following technical solutions: a kind of Valve clack device of valve, it comprises that one is sleeved on valve rod and can be along the axially movable main valve clack of valve rod, its center with respect to the front-end face of valve seat has one to lead to valve body and go out pressure guide hole runner, that can be closed by the valve rod bottom, there is the relief hole that leads to valve body influent stream road the side of main valve clack housing, has one on the body of rod of valve rod in the main valve clack housing and can drive the device that main valve clack starts fully.

In Valve clack device described in the utility model, the front-end face of main valve clack and valve gap constitute the main valve of valve jointly, and the bottom of valve rod and pressure guide hole constitute the pilot valve of valve jointly, when valve when closing under the situation breakdown fully, the instantaneous generation of the maximum axial force of valve rod, but owing to be to start pilot valve earlier, and the inside nominal diameter of pilot valve is less, the moment that the while pilot valve is opened, relief hole and pressure guide hole connect, reduced the axial force of medium to valve rod, therefore the unlatching of the drive main valve by the main valve clack starting drive again uses the startup running torque of valve of this Valve clack device less; Because there is relief hole the side of main valve clack, when pilot valve is opened, just can realize the perforation of valve body into and out of runner, medium both can flow to out runner from the influent stream road like this, also can flow to the influent stream road from going out runner, be that this Valve clack device opens and closes under the prerequisite of running torque in minimizing, also can realize the two-way flow of medium.

Below in conjunction with drawings and Examples the utility model is further described.

Fig. 1 is a kind of embodiment's the structural representation of the Valve clack device of valve described in the utility model.

Fig. 2 is the another kind of embodiment's of Valve clack device of a valve described in the utility model structural representation.

As shown in Figure 1, in a kind of embodiment of the Valve clack device of valve described in the utility model, the Valve clack device of valve is a combined type flap, it comprises a main valve clack 4, its front-end face 5 can contact the common main valve that constitutes valve with valve seat 2 sealings, the center of front-end face 5, have out with respect to valve rod 3 bottoms places and to go out runner 10 to valve body 1, the pressure guide hole 8 that can be closed by the valve rod bottom, the side of main valve clack 5 housings offers the relief hole 9 that leads to valve body 1 influent stream road 11, have one on the body of rod of valve rod 3 in main valve clack 5 housings and can drive the device 6 that main valve clack starts after the pilot valve unpacking, this device 6 is the boss 7 of a length greater than valve rod 3 diameters.

Another embodiment's of the utility model structure as shown in Figure 2, the device 6 that described drive main valve clack starts be a length greater than the pin 7 of valve rod 3 diameters '.

Working principle of the present utility model is as follows: when valve when closing under the situation breakdown fully, the instantaneous generation of the maximum axial force of valve rod 3, because what valve rod 3 started earlier is pilot valve, and the inside nominal diameter of pilot valve is less, the moment that the while pilot valve is opened, relief hole 9 connects with pressure guide hole 8, reduced the axial force of medium to valve rod 3, so running torque is less; When pilot valve is opened fully, by boss 7 or pin 7 ' drive, thereby start the rising of main valve, because there is relief hole 9 side of main valve clack 4, when pilot valve is opened, just can realize valve body 1 influent stream road 11, the perforation that goes out runner 10, medium both can flow to out runner 10 from influent stream road 11 like this, also can flow to influent stream road 11 from going out runner 10, promptly this Valve clack device also can be realized the two-way flow of medium reducing under the prerequisite that opens and closes running torque.

The Valve clack device of valve described in the utility model can be adopted by the valve of stop valve, high pressure valve, vacuum valve and other kind, and is especially better for the valve effect of using under the high pressure conditions.

Claims

1, a kind of Valve clack device of valve, it comprises that one is sleeved on that valve rod (3) is gone up and can be along the axially movable main valve clack of valve rod (3) (4), the center of its front-end face with respect to valve seat (2) (5) has one to lead to valve body (1) and go out pressure guide hole (8) runner (10), that can be closed by valve rod (3) bottom, there is the relief hole (9) that leads to valve body (1) influent stream road (11) side of main valve clack (4) housing, has one on the body of rod of valve rod (3) in main valve clack (4) housing and can drive the device (6) that main valve clack (4) starts.

2, according to the Valve clack device of the described valve of claim 1, it is characterized in that: the device (6) that described drive main valve clack (4) starts is the boss (7) of a length greater than valve rod (3) diameter.

3, according to the Valve clack device of the described valve of claim 1, it is characterized in that: the device (6) that described drive main valve clack (4) starts is the pin (7 ') of a length greater than valve rod (3) diameter.