CN2392959Y - Pre-guide balancing plunger type throttle valve - Google Patents

Abstract

The utility model relates to a pre-guide balancing plunger type throttle valve, which is the improvement on the internal structure of a throttle valve. Namely, the throttle valve is provided with a pre-guide balancing plunger structure, making use of a system pressure to reach dynamic balance which enables labor-saving of switching and helps sealing. The utility model is composed of a valve body, a valve rod, a pre-guide balancing plunger structure, etc. The utility model adopts sealing of an outlet end as main sealing and auxiliary sealing is hard sealing in order to reduce cost and increase the service life of the valve and universality of application environment.

Description

Pilot balanced plunger throttle valve

The utility model relates to a new pilot balance plunger type throttle valve, which is an improvement on the internal structure of the throttle valve, that is, a pilot balance plunger structure is arranged inside the throttle valve, and the system pressure is used to achieve dynamic balance so that the switch is labor-saving. and help seal the structure. It is mainly composed of valve body, valve stem, pilot balance plunger structure and so on.

Throttle valve is a throttling device widely used in industrial production. Its quality and performance directly affect the production and efficiency of enterprises. At present, the throttle valve used in industrial production and various projects mainly relies on the piston to adjust the flow between the inlet and the outlet. Due to the high pressure used by the throttle valve, the pressure on the piston body is relatively high, resulting in the piston body The friction force between the piston sleeve increases. When opening and closing, the force to be overcome by the hand wheel is mainly the friction force. Since the force is relatively large, it is time-consuming and laborious when switching. And because the throttle valve currently produced is sealed by the piston, the precision requirements of the piston and the piston sleeve are very high in the production process, which increases the difficulty of processing and increases the processing cost. In addition, the throttle valve piston currently produced is connected up and down, which requires that there must be a good seal between the piston sleeve and the valve body, and the main sealing effect between the piston and the piston sleeve is also required to be high. The throttle valve currently produced, the main seal relies on a complex sealing structure to achieve the sealing effect of the throttle valve itself, which increases the manufacturing cost, and due to the limitation of the O-ring material, the valve can only be used for non-corrosion, In an environment where the temperature cannot be too high or too low. More importantly, the O-ring is prone to aging and wear, which reduces the service life of the valve.

The purpose of this utility model is to avoid the disadvantages of the above-mentioned prior art and provide a new type of pilot balanced plunger throttle valve, which uses the pressure of the system itself to help the valve switch and seal, thereby saving labor on the switch, Tight sealing effect. It is mainly composed of a valve body (1), a valve stem (2), and a pilot balance plunger. Its main technical feature is that a pilot balance plunger is provided at one end of the valve stem (2) inside the valve body (1). structure, and make the large disc (7) at the top of the plunger the outlet sealing surface of the throttle valve.

Accompanying drawing 1 is the structural representation of the utility model.

Accompanying drawing 2 is the structural representation of pilot plunger in the utility model.

The descriptions of the attached drawings are as follows:

1----valve body 2----valve stem 3----piston sleeve 4----ball A

5----Piston 6----Small Disc 7----Big Disc 8----Ball B

9----Nut 10----Cavity A 11----Cavity B

In order to better realize the above-mentioned purpose of the utility model, the designer also designs the pilot balance plunger to be composed of a piston sleeve (3), a piston (5), a large valve disc (7) and a small valve disc (6), That is, the lower end of the valve stem (2) is connected with a small valve disc (6), and the outside of the small valve disc (6) is nested with a piston (5), and the lower end of the piston (5) is connected with a large valve disc (7); The connections between the rod (2) and the small valve disc (6), the piston (5) and the large valve disc (7) all adopt flexible connections.

Structural characteristics and working principle of the present utility model will be described in detail below in conjunction with accompanying drawing and embodiment:

In the actual design and manufacture, the designer of the utility model realizes its structural characteristics in this way: a set of plunger type pilot valve is installed at the lower end of the ordinary throttle valve stem (2), and the outlet end is changed to the whole valve. At the main seal, the main seal pair adopts a hard seal, and the gap between the piston (5) and the piston sleeve (3) is fit, and the piston divides the valve body into a cavity (10) and a cavity (11); and a large nut (9) Fix the piston sleeve (3) on the valve body (1). Since the position of the main seal is changed to the outlet of the valve, the piston sleeve (3) does not have any sealing effect, it only plays a guiding role and utilizes The waist-shaped groove and the piston processed above realize the throttling effect; the specific structure of the plunger-type pilot valve installed at the lower end of the valve stem is as follows: a semicircular groove is processed at the lower end of the valve stem (2), and the ball (4) or other In the form of flexible connection, a small disc (6) is connected to the valve stem, a piston (5) is put on the outside of the small disc (6), and the lower end of the piston (5) is also connected with a ball (8) or other flexible connections. Formally connected with a large valve disc (7), the upper and lower planes of the large valve disc are sealing surfaces, the lower sealing surface is the main sealing surface of the whole valve, and the upper sealing surface is the main sealing surface of the pilot valve.

In this way, during the opening process, when the valve is closed, since there is no seal between the piston sleeve (3) and the valve body (1), there is a clearance fit between the piston (5) and the piston sleeve (3). The pressure at the inlet is equal to the pressure of the cavity (10) and the cavity (11) in the valve body, and is higher than the pressure at the outlet. When opening, the valve stem is lifted up, the small disc of the pilot valve is opened, that is, the pilot valve is opened, and the liquid in the cavity (10) flows out quickly to the outlet. At this time, the flow resistance of the liquid in the cavity (11) is greater than that of the cavity ( 10) The flow resistance of the liquid in the cavity, that is, the discharge rate of the liquid in the cavity (10) is higher than the discharge rate of the liquid in the cavity (11), so that the pressure in the cavity (10) is gradually smaller than the pressure in the cavity (11), In this way, due to the effect of the pressure difference, the piston produces an upward movement tendency, that is, the liquid in the cavity (11) gives the piston an upward force, and the purpose of opening and saving labor is realized. During the closing process, when the valve is fully opened, the inlet pressure is equal to the outlet pressure and the pressure inside the cavity (10), and a static equilibrium is reached. When the valve is closed, the valve stem (2) moves downward, and the small disc (6) closes the pilot valve, so that the liquid in the cavity (10) cannot be discharged, and the inlet port and the outlet port are kept in communication, so that the cavity ( 10) The pressure of the internal liquid increases gradually. When the pressure is higher than the pressure at the outlet end, the piston will have a downward movement tendency, that is, the liquid in the cavity (10) will give the piston a downward force. So as to achieve the effect of helping to close the valve.

Since there are no parts requiring high processing precision among the parts inside the entire valve, and the structure is simple, the difficulty of processing the parts is greatly reduced, thereby reducing the processing cost and the cost of the entire valve. In the valve, the O-ring sealing pair is removed and replaced with two metal hard sealing pairs, which makes the valve not limited by the material of the O-ring and can be used in a wider range of environments. The piston (5) of the pilot valve divides the valve body into a cavity (10) and a cavity (11), and the pressure difference between the cavity (10) and the cavity (11) is controlled by the switch of the pilot valve, so that the piston (5 ) produces an upward or downward movement trend, thereby generating an upward or downward force, so that the valve can achieve the effect of saving effort on and off and helping to seal. In addition, it adopts the outlet end seal as the main seal, and the sealing pair as a hard seal, which greatly reduces the cost, and improves the service life of the valve and the versatility of the use environment.

Claims (3)

1. guide's balance plunger formula throttle valve, it is to be made of valve body (1), valve rod (2) and guide's balance plunger, it is characterized in that an end that is arranged on the inner valve rod (2) of valve body (1) is provided with guide's balance plunger structure, and make the big valve flap (7) of plunger top be the exit seal face of throttle valve.

2. guide's balance plunger formula throttle valve according to claim 1, it is characterized in that said guide's balance plunger is to be made of piston sleeve (3), piston (5) and big valve flap (7) and little flap (6), the lower end that is valve rod (2) is connected with little flap (6), the outside of little flap (6) nested piston (5), the lower end of piston (5) is connecting big valve flap (7).

3. guide's balance plunger formula throttle valve according to claim 1 is characterized in that being connected all to adopt and flexibly connecting between said valve rod (2) and little flap (6), piston (5) and the big valve flap (7).

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