CN102401146A

CN102401146A - Large-caliber small-torque ball valve

Info

Publication number: CN102401146A
Application number: CN2010102812778A
Authority: CN
Inventors: 蔡毅; 刘庆国; 陈广兵; 毛翠翠
Original assignee: SHANGHAI WEILUN VALVE CO LTD
Current assignee: SHANGHAI WEILUN VALVE CO LTD
Priority date: 2010-09-14
Filing date: 2010-09-14
Publication date: 2012-04-04

Abstract

The invention discloses a large-caliber small-torque ball valve. An external control assembly is arranged outside connecting bodies on both ends respectively, and the external control assembly is formed as follows: an inlet of a three-way valve is communicated with the connecting bodies, and two outlets are respectively communicated with an internal seal assembly and the external part of a valve body; and the internal seal assembly is formed as follows: an internal ring slot and an external ring slot are arranged at the internal ends of the connecting bodies, a valve seat is installed in the internal ring slot and the external ring slot in an axially sliding manner, and a plurality of springs for compressing the valve seat on the ball body are annularly distributed on the bottom of the internal ring slot. By operating the external control assembly, the internal seal assembly can be controlled to axially move forward and backward, the contact and disengagement between a seal ring of the valve seat and the ball body is further controlled, and the ball valve is opened and closed with a smaller torque.

Description

The little torque force ball valve of heavy caliber

Technical field

The present invention relates to a kind of ball valve, relate in particular to the little torque force ball valve of a kind of heavy caliber.

Background technique

In the product actual production, receive the influence of factors such as structure, seal face materials, friction factor, design torque and actual torque often have than large deviation and valve does not open, and fits badly, and rotates situation such as not smooth and happens occasionally.

Summary of the invention

To above defective, the present invention provides a kind of heavy caliber pipeline that is suitable for to use the little torque force ball valve of the heavy caliber that operational torque is little.

For realizing above-mentioned purpose; The present invention adopts following technological scheme: the little torque force ball valve of a kind of heavy caliber comprises valve body, the connecting body that install at the valve body two ends, the spheroid of body cavity, the stationary axle assembly of valve body lower portion, the valve gap assembly on valve body top, the interior black box that is installed in the interior valve rod that is connected with spheroid of valve gap, is provided with in the inner of two connecting bodys; It is characterized in that: black box is in the inner of connecting body inner groove and outer groove to be set in described; The diameter of inner groove is littler than the diameter of outer groove; The valve seat of the shape that matches with inner groove, outer groove and spheroid can be installed in inner groove and the outer groove axially slidably; The O RunddichtringO is arranged between the inwall of inner groove and outer groove and the valve seat, valve seat insert is installed in the circular groove of valve seat inner side end; Be pressed in the spring on the spheroid at a plurality of valve seats that make of the base circle distributed and arranged of inner groove; The external control assembly is installed outside connecting body, and the external control assembly comprises a three-way valve, and the inlet of three-way valve is communicated with the connecting body inner chamber through delivery line, and outlet of three-way valve is through the bottom of ingress pipe connection outer groove, and the outside is led in another outlet of three-way valve.

Lead in the outside outlet at three-way valve 21 and to add a cover plastic protective sleeve.

The invention has the beneficial effects as follows: 1. through operation external control assembly, black box axially moves forward and backward in can controlling, and then the contacting and disengaging of control valve seat seal ring and spheroid, to realize with less moment of torsion keying ball valve.For expensive pneumatic, electronic of configuration rates, surge, the gas-liquid linked ball valve that waits drive unit, it is remarkable to practice thrift cost effectiveness.2. specific torque is little mutually with the conventional structure ball valve for the ball valve of this structure, can select the more drive unit of small dimension, for the valve of driver such as pneumatic, electronic, as to surge, has practiced thrift the energy and cost.3. when selecting drivers such as solenoid valve for use when external control valve, PLC capable of using is provided with the switch delay function, carries out telecontrol.4. during valve switch, valve seat insert has broken away from spheroid, has avoided washing away of conventional structure ball valve sealing face switching point instantaneous high pressure, has protected sealing surface effectively.

Description of drawings

Fig. 1 is the little torque force ball valve of a heavy caliber of the present invention open mode cross-sectional view;

Fig. 2 is the little torque force ball valve of a heavy caliber of the present invention external control assembly cross-sectional view;

Among the figure: 1. black box, 2. external control assembly, 3. valve body, 4. connecting body, 5. spheroid in; 6. valve rod, 7. valve gap assembly, 8. stationary axle assembly, 11. valve seats; 12. valve seat insert, 13.O RunddichtringO, 14.O RunddichtringO, 15. springs; 21. three-way valve, 22. delivery lines, 23. ingress pipes, 25. plastic protective sleeves.

Embodiment

Below in conjunction with accompanying drawing and embodiment the present invention is further specified.

As depicted in figs. 1 and 2; The little torque force ball valve of a kind of heavy caliber comprises valve body 3, the connecting body 4 that install at valve body 3 two ends, the spheroid 5 of valve body 3 inner chambers, the stationary axle assembly 8 of valve body 3 bottoms, the valve gap assembly 7 on valve body 3 tops, the interior black box that is installed in the interior valve rod 6 that is connected with spheroid 5 of valve gap, is provided with in the inner of two connecting bodys 4; Black box 1 is in the inner of connecting body 4 inner groove and outer groove to be set in described; The diameter of inner groove is littler than the diameter of outer groove; The valve seat 11 of the shape that matches with inner groove, outer groove and spheroid 5 can be installed in inner groove and the outer groove axially slidably; O RunddichtringO 14,13 is arranged between the inwall of inner groove and outer groove and the valve seat 11, valve seat insert 12 is installed in the circular groove of valve seat 11 inner side ends; Three of base circle distributed and arranged at inner groove make valve seat be pressed in the spring 15 on the spheroid; External control assembly 2 is installed outside connecting body 4; External control assembly 2 comprises a three-way valve 21; The inlet of three-way valve 21 is communicated with connecting body 4 inner chambers through

delivery line

22, and 21 1 outlets of three-way valve are through the bottom of ingress pipe 23 connection outer grooves, and the outside is led in another outlet of three-way valve 21.Lead in the outside outlet at three-way valve 21 and to add a cover plastic protective sleeve 25.

When valve is normally opened work; Delivery line 22 is in normal open state with ingress pipe 23; Medium gets in the ring that forms between O RunddichtringO 13 and the O RunddichtringO 14 through delivery line 22, three-way valve 21, ingress pipe 23, promotes valve seat 11 and moves to spheroid 5 directions, and valve seat insert 12 closely contacts with spheroid 5; Seal pressure is greater than minimum necessary specific pressure, and valve effectively seals.

When needs switch main valve, shed plastic protective sleeve 25 earlier, swivel tee valve 21 handles again, ingress pipe 23 was connected with externally ported 24 of three-way valve 21 medium was discharged this moment, and the pressure medium in the ring between O RunddichtringO 13 and the O RunddichtringO 14 is laid down.Under the pressure medium effect, overcome spring 15 pretightening forces, promote valve seat 11 away from spheroid 5, valve seat insert 12 disengages with spheroid 5.The valve main drive begins 5 rotations of actuate valve stem 6 drive spheroids then.

After rotateing in place, three-way valve 21 delivery lines 22 that circle round again recover normal open state with ingress pipe 23, and pressure medium gets in the ring that forms between O RunddichtringO 13 and the O RunddichtringO 14 again, promotes valve seat 11 and advances, and valve seat insert 12 recovers effectively sealing with spheroid 5.

Claims

1. the little torque force ball valve of heavy caliber comprises valve body (3), the connecting body (4) that install at valve body (3) two ends, the spheroid (5) of valve body (3) inner chamber, the stationary axle assembly (8) of valve body (3) bottom, the valve gap assembly (7) on valve body (3) top, the interior black box that is installed in the interior valve rod (6) that is connected with spheroid (5) of valve gap, is provided with in the inner of two connecting bodys (4); It is characterized in that: black box (1) is in the inner of connecting body (4) inner groove and outer groove to be set in described; The diameter of inner groove is littler than the diameter of outer groove; The valve seat (11) of the shape that matches with inner groove, outer groove and spheroid (5) can be installed in inner groove and the outer groove axially slidably; O RunddichtringO (14,13) is arranged between the inwall of inner groove and outer groove and the valve seat (11), valve seat insert (12) is installed in the circular groove of valve seat (11) inner side end; Three of base circle distributed and arranged at inner groove make valve seat be pressed in the spring (15) on the spheroid; External control assembly (2) is installed outside connecting body (4); External control assembly (2) comprises a three-way valve (21); The inlet of three-way valve (21) is communicated with connecting body (4) inner chamber through delivery line (22); (21) outlets of three-way valve are through the bottom of ingress pipe (23) connection outer groove, and the outside is led in another outlet of three-way valve (21).

2. according to the little torque force ball valve of the described heavy caliber of claim 1, it is characterized in that: lead in the outside outlet at three-way valve (21) and add a cover plastic protective sleeve (25).