CN205226446U - Low moment of torsion ball valve with thrust pad - Google Patents

Abstract

A low-torque ball valve with a thrust pad. By setting a wedge-shaped thrust pad, there is a 2-degree angle difference between the thrust pad and the contact slope of the stuffing box. The thrust pad structure can prevent the rotation of the valve stem and the stuffing box from being scratched It can reduce friction and also play a sealing role. When the pressure of the valve cavity is higher, the sealing performance of the thrust pad is better. This thrust pad can solve the disadvantages of high-pressure valve stuffing box depth requirements and large pre-tightening force. In the current situation, the higher the pressure, the more obvious its superiority. The thrust pad of the utility model is a primary seal, and the stem packing is a secondary seal, so the number of packing layers is relatively reduced, and the original layer can be reduced to a layer, which is reduced by about 40%. , the pre-tightening force is also relatively reduced, that is, the friction torque between the valve stem and the packing can be relatively reduced. When the torque reduction requires the use of electric, pneumatic and other intelligent controls, the cost of the valve actuator can be significantly reduced. competitive strength.

Description

A low torque ball valve with a thrust pad

technical field

The utility model relates to the field of valves, in particular to a low-torque ball valve with a thrust pad.

Background technique

In the existing technology, the number of packing layers of the ball valve is mostly 5 layers. Due to the large number of packing layers, the pre-tightening force is large, and finally the friction torque between the valve stem and the packing of the ball valve is large, and the thrust pad in the existing ball valve is The flat form is only used to prevent the rotation of the valve stem and the stuffing box from being scratched and reduce friction, but it cannot play the role of sealing.

Contents of the invention

In order to solve the deficiencies of the prior art, the utility model provides a low-torque ball valve with a thrust pad.

The technical solution adopted by the utility model is: a low-torque ball valve with a thrust pad, including a valve body, a valve seat, a valve stem, a ball and an actuator, the top of the valve body is provided with a stuffing box, and the The stuffing box is provided with a stuffing chamber, the stuffing chamber is provided with stuffing, the front end of the valve stem is provided with a valve stem head, and the connection between the valve stem head, the valve stem and the stuffing box is provided with a thrust pad , the thrust pad is a wedge-shaped structure, and the contact surface between the wedge-shaped thrust pad and the stuffing box has an inclination angle of 2°.

The number of layers of the filler is 3 layers.

An electrostatic device is also provided on the valve stem head.

There is a mounting hole in the middle of the stuffing box, the valve stem head passes through the mounting hole and is connected to the sphere, and a sliding bearing is also provided for the connection between the mounting hole and the valve stem head.

The packing cavity is provided with a pressure sleeve, and the pressure sleeve is provided with a pressure plate, and the pressure plate is installed on the stuffing box through bolts.

A spring seat is provided between the valve body and the valve seat, a spring is provided in the spring seat, and a sealing ring is provided between the spring seat and the valve seat.

The beneficial effects of the utility model are: the utility model provides a low-torque ball valve with a thrust pad. By setting a wedge-shaped thrust pad, there is a 2-degree angle difference between the thrust pad and the contact slope of the stuffing box, and the thrust pad The structure can prevent the rotation of the valve stem and the stuffing box from being scratched, reduce friction, and also play a sealing role. When the pressure in the valve cavity is higher, the sealing performance of the thrust pad is better. This thrust pad can solve the problem of high pressure The depth of the valve stuffing box is required to be deep and the unfavorable situation of large pre-tightening force, the higher the pressure, the more obvious its advantages.

Description of drawings

Fig. 1 is the structural representation of the utility model.

Figure 2 is an enlarged view of the packing structure of the present invention.

Fig. 3 is an enlarged view of the structure of the thrust pad of the present invention.

In the figure 1-valve body, 2-valve stem, 3-ball, 4-actuator, 5-stuffing box, 6-thrust pad, 7-tilt angle, 11-valve seat, 12-spring seat, 13-seal Circle, 21-valve stem head, 22-static device, 23-sliding bearing, 51-filler, 52-pressure sleeve, 53-press plate.

detailed description

The utility model is further described in conjunction with Fig. 1, Fig. 2 and Fig. 3. A low-torque ball valve with a thrust pad includes a valve body 1, a valve seat 11, a valve stem 2, a ball 3 and an actuator 4. The top of the valve body 1 is provided with a stuffing box 5, the stuffing box 5 is provided with a stuffing cavity, and the stuffing cavity is provided with a stuffing 51, and the number of layers of the stuffing 51 is 3 layers. The stuffing chamber is provided with a pressure sleeve 52, and the pressure sleeve 52 is provided with a pressure plate 53, and the pressure plate 53 is installed on the stuffing box 5 through bolts. The front end of the valve stem 2 is provided with a valve stem head 21, and the connection between the valve stem head 21, the valve stem 2 and the stuffing box 5 is provided with a thrust pad 6, and the thrust pad 6 is a wedge-shaped structure, There is an inclination angle 7 of 2° at the contact surface between the wedge-shaped thrust pad 6 and the stuffing box 5 . The utility model is provided with a wedge-shaped thrust pad 6, and the angle difference between the thrust pad 6 and the contact slope of the stuffing box 5 is 2 degrees. The function of friction can also play a role of sealing. When the pressure of the valve cavity is higher, the sealing performance of the thrust pad 6 is better. The thrust pad 6 can solve the disadvantages of high-pressure valve stuffing box depth requirements and large pre-tightening force. The status quo, the higher the pressure, the more obvious its superiority. The thrust pad 6 of the utility model is a primary seal, and the stem packing 51 is a secondary seal, so the number of layers of the packing 51 is relatively reduced, from the original 5 layers to 3 layers, which is about 40% less, and the pre-tightening force is also relatively reduced. That is, the friction torque between the valve stem 2 and the stuffing 51 can be relatively reduced. When the torque reduction requires the use of electric, pneumatic and other intelligent controls, the cost of the valve actuator can be significantly reduced, and the company's competitiveness in the same industry can be strengthened.

An electrostatic device 22 is also provided on the valve stem head 21 .

A mounting hole is provided in the middle of the stuffing box 5 , and the valve stem head 21 is connected to the ball 3 through the mounting hole, and a sliding bearing 23 is also provided at the connection between the mounting hole and the valve stem head 21 .

A spring seat 12 is provided between the valve body 1 and the valve seat 11 , a spring is provided in the spring seat 12 , and a sealing ring 13 is provided between the spring seat 12 and the valve seat 11 .

The above descriptions are only preferred implementations of the present utility model, and the protection scope of the present utility model is not limited to the above-mentioned embodiments, and all technical solutions under the idea of the present utility model all belong to the protection scope of the present utility model. It should be pointed out that for those skilled in the art, some improvements and modifications without departing from the principle of the utility model should also be regarded as the protection scope of the utility model.

Claims (6)

1. A low-torque ball valve with a thrust pad, comprising a valve body (1), a valve seat (11), a valve stem (2), a ball (3) and an actuator (4), the valve body (1 ) top with a stuffing box (5), the stuffing box (5) is provided with a stuffing chamber, the stuffing chamber is provided with a filler (51), and the front end of the valve stem (2) is provided with a valve stem head (21), characterized in that a thrust pad (6) is provided at the connection between the valve stem head (21) and the valve stem (2) and stuffing box (5), and the thrust pad (6) ) is a wedge-shaped structure, and the contact surface between the wedge-shaped thrust pad (6) and the stuffing box (5) has an inclination angle (7) of 2°. 2. A low-torque ball valve with a thrust pad according to claim 1, characterized in that, the number of layers of the packing (51) is 3. 3. A low-torque ball valve with a thrust pad according to claim 1, characterized in that an electrostatic device (22) is also provided on the stem head (21). 4. A low-torque ball valve with a thrust pad according to claim 1, characterized in that there is a mounting hole in the middle of the stuffing box (5), and the stem head (21) passes through the mounting hole. The hole is connected with the sphere (3), and the connection between the installation hole and the stem head (21) is also provided with a sliding bearing (23). 5. A low-torque ball valve with a thrust pad according to claim 1, characterized in that, the packing cavity is provided with a pressing sleeve (52), and the pressing sleeve (52) is provided with a pressing plate (53), the pressure plate (53) is installed on the stuffing box (5) through bolts. 6. A low-torque ball valve with a thrust pad according to claim 1, characterized in that, a spring seat (12) is provided between the valve body (1) and the valve seat (11), so that A spring is provided inside the spring seat (12), and a sealing ring (13) is also provided between the spring seat (12) and the valve seat (11).