Internally pre-tightened valve

Abstract

The invention discloses an internally pre-tightened valve. The internally pre-tightened valve comprises a valve body and further comprises a valve cover arranged on the valve body, a switch part pivoted on the valve cover, a handle arranged at the upper end of the switch part, a flow adjusting part and a filtering part which are arranged at the water inlet end of the valve body, wherein the switch part comprises an operating rod and further comprises an adjusting cylinder screwed on the operating rod, a first sliding groove concavely formed in the inner wall of the adjusting cylinder, an adjusting plate arranged on the operating rod and capable of sliding in the first sliding groove, a first spring and a second spring which are sleeved on the operating rod, a guide cylinder arranged at the lower end of the adjusting cylinder, a sealing plate arranged at the lower end of the operating rod, a first sealing frame arranged at the edge of one side of the sealing plate, a first screw screwed on the first sealing frame, a third spring sleeved on the first screw and pressed in the first sealing frame, a valve clack arranged on the lower side of the sealing plate, and a sealing strip arranged at the edge of the other side of the sealing plate. The internally pre-tightened valve is good in sealing performance.

Description

technical field [0001] The invention relates to the technical field of valves, in particular to an internal preloaded valve. Background technique [0002] A valve is a device that makes or stops the flow of media (liquid, gas, powder) in piping and equipment, and can control its flow. The valve is a control component in the pipeline fluid delivery system. It is used to change the passage section and the flow direction of the medium. Valves are widely used in all walks of life in industrial production and life, and are indispensable devices for domestic water pipelines and industrial fluid pipelines. [0003] When the valve cuts off the water flow, the disc of the valve and its surrounding parts adopt a split structure, and gaps are prone to appear around the disc, resulting in poor sealing, and water leaks out from the gaps. Especially when the impact force of the water flow in the water inlet pipe is relatively large, the upward extrusion force of the water flow on the va...

AI Technical Summary

Problems solved by technology

[0003] When the valve cuts off the water flow, the disc of the valve and its surrounding parts adopt a split structure, and gaps are prone to appear around the disc, resulting in poor sealing, and water leaks out from the gaps.

Especially when the impact force of the water flow in the water inlet pipe is large, the water flow will squeeze the valve disc upward, which will cause gaps to appear around the valve disc and cause liquid leakage.

Most of the discs of the current valves are simply squeezed between the water inlet pipe and the water outlet pipe, which lacks the necessary pre-tightening parts and cannot apply a compressive force to it, resulting in easy liquid leakage

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