RU91398U1 - CHECK VALVE - Google Patents

Abstract

1. The check valve, comprising a direct-flow housing with a cowl and a damper in the form of a cylinder with damping fluid, a seat fixed in the body, a shutter with a piston dividing the cylinder into two cavities, rigidly connected with a spring-loaded rod with the possibility of axial movement along the axis of the valve, characterized the fact that during the reverse flow of fluid, the shutter smoothly closes, eliminating water hammer, due to the hydraulic resistance formed by the design gap between the inner diameter of the cylinder phera and piston outer diameter. ! 2. The check valve according to claim 1, characterized in that the damper cylinder is filled with a constant volume damping fluid through an opening connecting the cylinder cavity to the outer surface of the valve. ! 3. The check valve according to claim 1, characterized in that the braking speed during the movement of the shutter can be changed due to variable along the length of the diameter of the cylinder.

Description

The proposed utility model relates to the field of mechanical engineering - valve engineering, intended for use as shutoff valves for smoothly shutting off the return flow of a fluid liquid or gaseous medium in pipelines with difficult operating conditions. (for example, at hydraulic pumping stations with many pumps and valves).

The prototype of the utility model is a non-return valve, protected by the RF patent for the invention RU 2184296 C2 IPC 7 F16K 07/15/27

The prototype contains a housing with inlet and outlet cavities, a saddle, a locking member, spring pressed to the saddle. A power cylinder is placed on the locking body, the working chamber of which is in communication with the output cavity of the housing through a throttle hole between the cylinder and the chamber of constant volume, and the rod. A constant-volume chamber is placed between the power cylinder and the tube with an ejector nozzle. The opening of the valve occurs under the action of a fluid acting on a locking member with a ram; in this case, the rod compresses the spring located between the chamber of constant volume and the end face of the locking element, and the power cylinder, sliding on the skirt of the chamber of constant volume through a gap of variable cross-section, creates a braking of the opening speed, ensuring a smooth ride. When the pressure on the inlet cavity decreases, the shut-off element returns under the action of excess pressure on the outlet cavity and the spring to the “closed” position.

The disadvantage of the prototype is the ineffective application for gaseous media and the absence of inhibitory action when closing the valve on liquid media.

The objective of the proposed utility model is to increase the service life of the valve due to shock-free operation when opening and closing.

The proposed check valve contains a direct-flow housing 1 with a cowl 2, the inner front of which is the cylinder 3 of the damper. A saddle 4 is fixed to the inlet pipe of the housing 1, to which a shutter 6 is drawn by a spring 5, fixed to the rod 7. A piston 8 is fixed to the rod 7 with the possibility of its movement together with the rod 7 along the axis of the valve. The piston 8 divides the cylinder 3 with the damping fluid into two cavities “a” and “b”. The cylinder 3 of the damper has a closed (constant) volume of damping fluid filled through the hole "b" connected to the outer surface of the housing. A constant volume of damping fluid is provided by the cavity formed by the cylinder walls, the cover 9 and the rod 7. Between the outer diameter of the piston 8 and the inner diameter of the cylinder 3 there is a calculated guaranteed clearance “z”, which provides hydraulic resistance when the shutter 6 moves to open or close and eliminates water hammer when closing the valve. In some cases, the transported fluid may serve as a damping fluid.

The technical result is to increase the life of the valve, eliminating the hydraulic shock of the shutter and seat due to the smooth flow of the damping fluid from one cavity to another, the independence of the shutter from the degree of contamination of the fluid.

The following drawings illustrate, as an example, the implementation of the proposed utility model "Check Valve", confirming the possibility of its industrial application using the totality of features, where:

Figure 1 - check valve in the "closed" and "open"

The check valve operates as follows.

When the medium is directly supplied to the valve body 1 through the inlet pipe, the overpressure pressure exerts on the shutter 6, the spring 5 compresses, the piston 8 presses on the damping fluid, forcing it to flow smoothly from cavity “b” to cavity “a”, the shutter 6 opens smoothly providing a direct flow of fluid from the inlet to the outlet. When the flow direction changes, the fluid and the spring 5 through the rod 7 press on the valve 6 and the piston 8, forcing the damping fluid to flow from the cavity "a" into the cavity "b", providing a smooth closing of the valve without a hydraulic shock. In this case, it is possible to adjust the closing and opening speeds of the valve due to the cylinder diameter that is variable along the length.

Check Valve

The list of items for the application for a utility model "Check valve"

1 - case

2 - fairing

3 - cylinder

4 - saddle

5 - spring

6 - shutter

7 - stock

8 - piston

9 - cover

"A", "b" - cavity with damping fluid

"Z" - guaranteed design clearance between the cylinder and the piston

“C” - channel for filling with damping fluid

Claims (3)

1. The check valve, comprising a direct-flow housing with a cowl and a damper in the form of a cylinder with damping fluid, a seat fixed in the body, a shutter with a piston dividing the cylinder into two cavities, rigidly connected with a spring-loaded rod with the possibility of axial movement along the axis of the valve, characterized the fact that during the reverse flow of fluid, the shutter smoothly closes, eliminating water hammer, due to the hydraulic resistance formed by the design gap between the inner diameter of the cylinder phera and piston outer diameter. 2. The check valve according to claim 1, characterized in that the damper cylinder is filled with a constant volume damping fluid through an opening connecting the cylinder cavity to the outer surface of the valve. 3. The check valve according to claim 1, characterized in that the braking speed during the movement of the shutter can be changed due to variable along the length of the diameter of the cylinder.