CN205654906U - New low torque trunnion ball valve - Google Patents

Abstract

The utility model discloses a novel low moment of torsion ball valve of fixing because its elastic mechanism's setting can make disk seat elasticity support and press in the case for can continuously keep between case and the disk seat pasting tightly, in addition, when fluid medium entered into the clearance between elastic mechanism and the disk seat, fluid medium can have certain thrust to the disk seat, and this thrust can make the disk seat support and press the case equally, thereby has further increased the leakproofness between case and the disk seat. The utility model discloses reduce the pretightning force between disk seat and the case as far as possible under the effective sealed prerequisite between case and the disk seat, consequently can reduce the wearing and tearing between case and the disk seat, reduce the moment of torsion of valve rod, improve the life of ball valve, make the valve open and close and become easier.

Description

New low torque trunnion ball valve

technical field

The utility model relates to a novel low-torque fixed ball valve.

Background technique

Ball valve is a kind of valve whose opening and closing part (ball core) is driven by the valve stem, and rotates 90 degrees around the axis of the valve stem. It is mainly used for fluid adjustment and control. Since its birth, ball valves have been widely used in petroleum refining, long-distance pipelines, chemical industry, papermaking, pharmaceuticals, water conservancy, electric power, municipal, steel and other industries, and are indispensable parts in the mechanical field.

Ball valves are generally divided into floating ball valves and fixed ball valves. Among them, the fixed ball valve is a new generation of high-performance ball valve, which is suitable for long-distance pipelines and general industrial pipelines. Its strength, safety, and resistance to harsh environments have been specially considered in the design, and it is suitable for various corrosive and non-corrosive media. .

The traditional trunnion ball valve usually includes a spool, valve body, valve stem and actuator. The body is also provided with a valve seat that cooperates and seals with the valve core, and the valve seat is fixedly arranged in the valve body and tightly pressed and fixed with the valve core. Although this sealing structure can improve the sealing performance between the valve seat and the valve body, the ball valve is likely to cause wear between the valve seat and the valve core after long-term use, resulting in leakage of the fluid medium. In addition, due to the large pre-tightening force between the valve seat and the valve core, the torque of the valve stem is also very large, the valve core is easily stuck, and the opening and closing of the valve will become very difficult.

Utility model content

Aiming at the deficiencies of the prior art, the main purpose of this utility model is to provide a new low-torque fixed ball valve, which has a simple structure, can reduce the wear between the valve core and the valve seat, reduce the torque of the valve stem, and improve the service life of the ball valve , and make the valve opening and closing easier.

In order to achieve the above purpose, the utility model provides a new low-torque fixed ball valve, which includes a valve core, a valve body, a valve stem and an actuator. The actuator drives the valve stem to drive the valve core to rotate. The valve body is also provided with a valve seat that cooperates and seals with the valve core. There is an elastic mechanism between the valve body and the valve seat that elastically presses the valve seat against the valve core. The elastic mechanism includes a spring and a spring retaining ring cooperating with it. The valve seat includes an annular sealing ring and a mounting seat. The sealing ring is embedded in the inner side of the mounting seat and presses against the valve core. The mounting seat can be axially slid. In the inner hole of the valve body and pressed against the spring.

As a further improvement of the utility model, a sealing ring is provided on the adjacent side wall between the sealing ring and the mounting seat, and a sealing ring is provided on the adjacent side wall between the mounting seat and the valve body. The advantage of such arrangement is that it can prevent the fluid medium from leaking from the sealing ring of the valve seat and the installation seat, and between the installation seat of the valve seat and the valve body, thereby further increasing the sealing performance of the ball valve.

As a further improvement of the utility model, the valve body includes a valve body main part and a valve body parallel part connected and fixed to each other through a flange structure, the valve core is arranged in the inner hole of the valve body main part, and the valve body parallel part There is an annular shoulder step for embedding the valve seat and the elastic mechanism in the inner hole of the valve body, and the valve seat and the elastic mechanism are embedded at the annular shoulder step of the inner hole of the valve body. The advantage of such setting is: due to the setting of the main valve body and the valve body, it is convenient to disassemble and assemble the ball valve, so that the internal parts of the ball valve can be replaced and maintained. Due to the setting of the annular shoulder step in the inner hole of the valve body, the valve seat and the elastic mechanism can be supported to a certain extent, and at the same time, the installation of the valve seat and the elastic mechanism is more stable.

As a further improvement of the utility model, the inner hole of the valve body includes an inlet channel with a narrow inner diameter and an outlet channel with a wider inner diameter, the inlet channel and the outlet channel form the annular shoulder, and the spring is fixed The inner diameter of the ring is smaller than the inner diameter of the inlet channel. The advantage of this arrangement is that it provides a force application site for the disassembly of the spring retainer, which facilitates the disassembly of the spring retainer.

As a further improvement of the utility model, a plurality of axially arranged installation holes are evenly distributed on the upper surface of the end surface of the spring fixing ring adjacent to the valve seat, and springs are sleeved in the installation holes. The advantages of this setting are: the simple structure of the spring retaining ring makes the processing more convenient, the evenly distributed springs can evenly apply force to the valve seat, making the seal between the valve seat and the valve core more stable, and the mounting holes on the spring retaining ring The setting of the spring can not only keep the spring in the elastic direction, but also prevent the spring from falling off from the spring retaining ring, so that the work of the spring is more stable.

The beneficial effects of the utility model are: the utility model can make the valve seat elastically press against the valve core due to the setting of the elastic mechanism, so that the valve core and the valve seat can be continuously kept in close contact. In addition, when the fluid medium enters the elastic When the gap between the mechanism and the valve seat is closed, the fluid medium will have a certain thrust on the valve seat, and this thrust will also force the valve seat to press against the valve core, thereby further increasing the sealing performance between the valve core and the valve seat. The utility model reduces the pre-tightening force between the valve core and the valve core as much as possible under the premise of effective sealing between the valve core and the valve seat, so that the wear between the valve core and the valve seat can be reduced, and the torque of the valve stem can be reduced , improve the service life of the ball valve, and make the opening and closing of the valve easier.

Description of drawings

Fig. 1 is the schematic sectional view of the utility model;

Fig. 2 is a partial enlarged schematic diagram of part A in Fig. 1 of the present utility model;

Fig. 3 is a schematic plan view of the spring retaining ring of the present utility model.

detailed description

The embodiment of the new low-torque fixed ball valve of the present utility model is shown in Figures 1 to 2: it includes a spool 4, a valve body 3, a valve stem 6 and an actuator 7, and the spool 4 is connected to the valve stem at both ends of the spool 4. 6 is rotatably arranged inside the valve body 3, the actuator 7 drives the valve core 4 to rotate by driving the valve stem 6, and the valve body 3 is also provided with a valve seat 1 that cooperates with the valve core 4 to seal, and the valve body 3 and the valve seat 1 is provided with an elastic mechanism 2 that elastically presses the valve seat 1 against the valve core 4. The elastic mechanism 2 includes a spring 22 and a spring retaining ring 21 fitted with it. The valve seat 1 includes an annular sealing ring 12 and The mounting seat 11 and the sealing ring 12 are embedded inside the mounting seat 11 and press against the valve core 4 . The mounting seat 11 is preferably made of wear-resistant stainless steel, and the setting of the mounting seat 11 can prevent abrasion between the sealing ring 12 and the inner wall of the valve body 3 . The sealing ring 12 is preferably made of polytetrafluoroethylene, which has the advantages of corrosion resistance and low friction coefficient.

A sealing ring 5 is provided on the adjacent side wall between the sealing ring 12 and the mounting seat 11 , and a sealing ring 5 is provided on the adjacent side wall between the mounting seat 11 and the valve body 3 .

The valve body 3 includes a valve body main part 31 and a valve body parallel part 32 that are connected and fixed to each other through a flange structure. The valve body main part 31 and the valve body parallel part 32 can be assembled and disassembled through a flange structure. The valve core 4. Set in the inner hole of the main part 31 of the valve body. The inner hole of the valve body and part 32 has an annular shoulder step for embedding the valve seat 1 and the elastic mechanism 2. The valve seat 1 and the elastic mechanism 2 is embedded in the annular shoulder of the inner hole of the valve body and part 32.

The inner hole of the valve body and part 32 includes an inlet channel with a narrower inner diameter and an outlet channel with a wider inner diameter, the inlet channel and the outlet channel form the annular shoulder, and the inner diameter of the spring retainer 21 is smaller than the inner diameter of the The inner diameter of the entry channel. When the spring retaining ring 21 needs to be disassembled, the spring retaining ring 21 can be easily taken out from the inner hole of the valve body and part 32 only by using a specific tool to apply force to the edge of the inner diameter of the spring retaining ring 21 , which is very convenient.

As shown in FIG. 3 , a plurality of axially arranged installation holes 23 are evenly distributed in the circumferential direction on the end surface of the spring retaining ring 21 adjacent to the valve seat 1 , and the springs 22 are sleeved in the installation holes 23 . In the present invention, the spring 22 is directly pressed against the end surface of the valve seat 1, so the spring fixing ring 21 preferably has the above-mentioned structure.

When the utility model is in the working state, the fluid medium enters from the inlet channel of the valve body and part 32, and when the fluid medium enters the gap between the elastic mechanism 2 and the valve seat 1, the fluid medium will have a certain force on the valve seat 1. Thrust, the thrust will make the valve seat 1 press against the valve core 4, thereby increasing the sealing performance between the valve core 4 and the valve seat 1.

The utility model reduces the pre-tightening force between the valve core and the valve core as much as possible under the premise of effective sealing between the valve core and the valve seat, so that the wear between the valve core and the valve seat can be reduced, and the torque of the valve stem can be reduced , improve the service life of the ball valve, and make the opening and closing of the valve easier.

The above embodiments are only preferred specific embodiments of the utility model, and the usual changes and replacements performed by those skilled in the art within the scope of the technical solution of the utility model are included in the protection scope of the utility model.

Claims (5)

1. A new type of low torque fixed ball valve, including a valve core, a valve body, a valve stem and an actuator. The core rotates, and a valve seat that cooperates with the valve core to seal is also provided in the valve body. It includes a spring and a spring retaining ring that is installed in conjunction with it. The valve seat includes an annular sealing ring and a mounting seat. The sealing ring is embedded in the inner side of the mounting seat and pressed against the valve core. The mounting seat can be axially slid on the valve body. In the inner hole and press against the spring. 2. The novel low-torque fixed ball valve according to claim 1, characterized in that: a sealing ring is provided on the adjacent side wall between the sealing ring and the mounting seat, and a sealing ring is provided between the mounting seat and the valve body. Sealing rings are provided on adjacent side walls. 3. The novel low-torque fixed ball valve according to claim 1, characterized in that: the valve body includes a valve body main part and a valve body parallel part connected and fixed to each other through a flange structure, and the valve core is arranged on the valve In the inner hole of the main part of the valve body, there is an annular shoulder step for embedding the valve seat and the elastic mechanism in the inner hole of the valve body and the elastic mechanism, and the valve seat and the elastic mechanism are embedded in the inner part of the valve body At the annular shoulder of the hole. 4. The novel low-torque trunnion ball valve according to claim 3, characterized in that: the inner hole of the valve body includes an inlet passage with a narrower inner diameter and an outlet passage with a wider inner diameter, and the inlet passage and the outlet A channel forms the annular shoulder, the inner diameter of the spring retainer being smaller than the inner diameter of the inlet channel. 5. The novel low-torque fixed ball valve according to claim 1, characterized in that: on the end surface of the spring fixed ring adjacent to the valve seat, there are a plurality of axially arranged installation holes evenly distributed in the circumferential direction, and the installation A spring is sheathed in the hole.