SU1146510A1 - Check valve - Google Patents

Abstract

CHECK VALVE, comprising a housing with a flow channel in which a saddle is placed, a lift stop and guides interacting with a ball locking organ, characterized in that, in order to increase reliability and enhance functionality, the guides are made in the form of elastic threads, the ends of which rigidly fixed in the case. 4i od sp

Description

The invention relates to a valve industry, namely, devices for controlling the flow of liquids and gases.

A ball check valve is known, comprising a body, a saddle, a stop for raising the locking member and elastic guides in which the ball locking member is mounted. The guides of such a valve are made in the form of ribs of elastic material 1.

The valve of this design has drawbacks. The size of the gap between the ball locking member and the guides is commensurate with the size of the particles that are in the fluid flowing through the valve. Particles that fall between the guides and the ball locking organ cause the ball locking organ to become jammed due to the commensurability of the width of the rib with the size of the solid particle and the failure in operation, indicating a low reliability.

In addition, when abrasive particles adhere to the guides come into contact with the surface of the ball valve, micro-burrs are formed on the latter, which aggravate the edge of the valve seat and cause leaks.

A check valve is also known, comprising a housing with a flow passage in which a saddle, a lift limiter, and guides interacting with a ball closure member are placed. The guides are made in the form of rigid rods of circular cross section.

The valve with round guides is less susceptible to jamming of the closure member due to the fact that the particles are much more difficult to hold onto such a guide 2.

However, when sticking to the guide of a solid particle, the dimensions of which are commensurate with the size of the gap between the ball locking member and the guide, the possibility of jamming of the locking member remains. In addition, micro-throttles may form on the surface of the ball valve body, reducing valve tightness and reliability.

The purpose of the invention is to increase the reliability of the valve and expand its functionality by operating on contaminated liquids and liquids with high viscosity.

The goal is achieved by the fact that in a check valve containing a housing with a flow channel in which a saddle is placed, a lift stop and guides interacting with the locking member, the guides are made in the form of elastic threads whose ends are rigidly fixed in the housing.

FIG. 1 shows a check valve, a longitudinal section; in fig. 2 - view A FIG. one;

in fig. 3 and 4 are variants of a ball valve with a lift limiter formed by a part of the elastic thread.

The check valve includes a housing 1 with a passage 2 and a saddle 3, integral with the housing and provided with a sealing lip 4.

In the upper part of the body 1, the radial holes 5 are evenly spaced. In the seat 3, the vertical holes 6 are evenly spaced. Each pair of holes 5 and 6 is located in the same vertical plane. Through these holes, resilient metallic threads are threaded - guides 7 with a diameter of 0.2-0.3 mm, the ends of which are fixed in the housing 1 and the saddle 3. In the housing 1 there is a spherical locking member 8, the lift of which is limited by a lift limiter 9 with a hole 10 to exit the fluid and grooves 11, through which the fluid flows freely in case of 0 being blocked by the ball valve 8 of the hole 10.

FIG. Figure 3 shows a variant of a check valve in which the elastic thread is drawn through slots 12 parallel to the axis of the valve and cut in the upper part of the core 5 of the rest 1 and the seat 3. The check valve of this design is installed in a vertical position.

The check valve operates as follows.

With increasing pressure in front of the valve, i.e., from the side of the seat 3, the ball valve 8 moves in the guides 7 towards the lift limiter 9 under the action of fluid flow. In this case, the elastic guides 7 do not exert resistance to the ball shut-off organ 8. In the case of a hard abrasive particle falling between the surface of the locking member 8 and the guide 7, the force that occurs when the ball locking member 8 is jammed causes the elastic deformation of the guide 7, and the ball locking organ 8 continues to move.

When the ball locking member 8 is lifted from the saddle 3, the fluid flows through channel 2, flows around the ball locking member 8 and out through the opening 10. The lifting of the ball locking member 8 is limited by the lift limiter 9. When the pressure in front of the valve decreases or the pressure increases behind the valve, the ball valve 8 under its own weight moves in the guides 7 down, sits on the sealing lip 4. and cuts off the volume of liquid behind the valve from the volume of liquid in front of the valve.

Small mechanical solids, falling on the guides 7, cannot be held on them due to the small diameter of the elastic thread and good flow of the guides 7 by the fluid flow.

Claims (1)

CHECK VALVE, comprising a housing with a passage channel in which a saddle, a lift stop and guides interacting with a ball locking body are located, characterized in that, in order to increase reliability and expand functionality, the guides are made in the form of elastic threads, the ends of which are rigidly fixed in the case.