CN111102386A

CN111102386A - Piston type check valve

Info

Publication number: CN111102386A
Application number: CN201811267124.0A
Authority: CN
Inventors: 冯爱军
Original assignee: Nanchong Dayu Water Technology Co ltd
Current assignee: Nanchong Dayu Water Technology Co ltd
Priority date: 2018-10-29
Filing date: 2018-10-29
Publication date: 2020-05-05

Abstract

The invention relates to a piston type check valve, which comprises a water inlet (1), a water outlet (2), a valve body (3) and a valve core (5), and is characterized in that the lower part of the valve core is a convex cylindrical valve body cavity, the inner cavity of the middle upper part of the valve core is internally provided with a circular ring upper baffle (7), the bottom of the valve core is provided with a circular ring lower baffle (8), a valve clack (4) is a circular plate which is embedded in the valve core cavity and is positioned on the circular ring lower baffle, a cylindrical spring (6) is arranged in the valve core cavity, one end of the spring is abutted against the circular ring upper baffle on the inner cavity of the valve core, the other end of the. The fixed valve clack of the traditional center rod is changed into the fixed valve clack of the inner wall of the valve core, so that the friction of parts is effectively reduced, and the service life is prolonged.

Description

Piston type check valve

Technical Field

The invention relates to a check valve, in particular to a piston type check valve which can effectively reduce abrasion, prolong the service life of the valve and ensure the sealing effect.

Technical Field

The check valve is an indispensable important component in the transportation of a tap water pipeline, and can effectively ensure the one-way movement of water and prevent backflow. However, most of the traditional check valves are composed of a valve core, a valve body and a valve core fixing plate. The valve core is a blocking plate for closing a flow passage and a central rod at the upper end of the blocking plate for fixing the position of the valve core, and the valve core fixing plate is a supporting plate for nesting and fixing the central rod of the valve core. When the tap water flows back, the blocking plate on the valve core is vertically moved downwards under the guide of the fixed plate under the pressure of the water, and the valve body flow passage is closed. The central rod of the valve core is always contacted with the valve core fixing plate, and because of long-term up-and-down movement and uneven force acting on the valve core blocking plate when tap water flows back, the central rod of the valve core and the valve core fixing plate rub for a long time, and finally, the gap between the central rod of the valve core and the valve core fixing plate is wider and wider, so that the valve core is intermittently or permanently inclined or even stuck, and leaks until losing the non-return function.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide a piston type check valve which changes the traditional center rod fixed valve clack into a valve core inner wall fixed valve clack, effectively reduces the friction of parts and prolongs the service life. The invention is realized by the following technical scheme: the invention comprises a water inlet, a water outlet, a valve body and a valve core, and is characterized in that the lower part of the valve core is a convex cylindrical valve body cavity internal thread or welded with a hollow cylindrical valve core, a circular ring upper baffle is arranged on an inner cavity of the middle upper part of the valve core, a circular ring lower baffle is arranged at the bottom of the valve core, the valve clack is a circular plate embedded in the valve core cavity and positioned on the circular ring lower baffle, a cylindrical spring is arranged in the valve core cavity, one end of the spring is abutted against the circular ring upper baffle on the inner cavity of the valve core, the other end of the spring is.

The working principle of the invention is that tap water enters the valve body from the water inlet, the valve flap is pushed to move upwards under the action of pressure, the spring is compressed, and the tap water enters the inner cavity of the valve body through the hollow opening and flows out from the water outlet. When the tap water pressure is not sufficient. The pressure at the upper end of the valve clack is equal to or greater than the pressure at the lower end, the spring expands to push the valve clack to move downwards until the valve clack is contacted with the lower baffle of the lower ring of the valve core, and the flow channel is closed. The whole process valve clack does up-and-down motion in the cylindrical environment that the case constitutes, and the motion of engine piston is similar because the valve clack is wrapped up and down by the case and all is equipped with the ring baffle, and spring and valve clack can do the free motion from top to bottom in the case, so the valve clack is fixed in the centre by the case and does not take place the skew. The gap between the valve clack and the inner wall of the valve core is filled with tap water, so that the valve core is lubricated and the friction is fully reduced. The fixed valve clack of the traditional center rod is changed into the fixed valve clack of the inner wall of the valve core, so that the friction of parts is effectively reduced, and the service life is prolonged. From the above, it can be seen that the objects of the present invention can be achieved.

Drawings

FIG. 1 is a schematic view of the structure of the present invention.

Detailed description of the preferred embodiments

Embodiment 1, as shown in fig. 1, the invention includes a water inlet 1, a water outlet 2, a valve body 3, a valve core 5, and is characterized in that the lower part is a convex cylindrical valve body cavity internal thread or welded with a hollow cylindrical valve core, a circular ring upper baffle 7 is arranged on the inner cavity of the middle upper part of the valve core, a circular ring lower baffle 8 is arranged at the bottom, a valve flap 4 is a circular plate embedded in the valve core cavity and positioned on the circular ring lower baffle to prevent the valve flap from falling off from the lower part, and a spring 6 is arranged in the valve core 5 cavity. The circular ring upper baffle of the valve core 5 is propped against the cylindrical spring 6 to prevent the spring 6 from falling off from the upper end. The lower end of the spring 6 is supported by the disc-shaped valve flap 4, and a gap is reserved between the valve flap 4 and the inner wall of the valve core 5. Can move up and down in the inner cavity of the valve core 5. When running water enters from the water inlet 1, the valve clack 4 is pushed to move upwards, the hollow-out opening is communicated with the convex cavity of the valve body, and the running water flows out from the water outlet 2. When water is cut off or the water inlet pressure is lower than the water outlet pressure, the valve clack 4 moves downwards to the lowest point. And is contacted with the lower baffle of the circular ring of the valve body 3. Thereby closing the valve body flow passage and preventing the running water from flowing backwards.

Claims

1. The utility model provides a piston check valve includes water inlet (1), delivery port (2), valve body (3), case (5), a serial communication port, the lower part is convex cylinder valve body chamber internal thread or welding has the fretwork cylinder case, be equipped with ring overhead gage (7) in the case on the upper portion inner chamber, the bottom is equipped with baffle (8) under the ring, valve clack (4) are inlayed in the case cavity for the plectane, be located under the ring on the baffle, case intracavity is equipped with cylinder spring (6), spring one end supports on the ring overhead gage on the case inner chamber, the other end then supports on the plectane valve clack, case and valve clack, be equipped with the clearance between the spring.