Low and medium-pressure pneumatic balanced stop valve

Abstract

The invention relates to a low and medium-pressure pneumatic balanced stop valve which comprises a valve body provided with a water inlet channel and a water outlet channel, wherein a valve seat is arranged on the valve body; a sealing gasket is arranged at the contact part of the valve seat and the valve body; a valve clack is fixedly connected to the valve seat. The stop valve also comprises a cylinder seat and a cylinder barrel provided with an upper air source through hole and a lower air source through hole. A piston and a piston rod are arranged in the cylinder barrel. The bottom end of the cylinder barrel is fixedly connected with the valve body. One end of the piston rod is fixedly connected with the piston while the other end of the piston rod is fixedly connected with the valve seat. A guide platform is arranged below the cylinder seat. A guide barrel is arranged on the upper part of the valve clack. The guide platform and the guide barrel are in sealing cup joint. Under the conditions with any pressure difference of a water current medium, the opening and the closing of the stop valve are convenient, free, easy and labor-saving; the integral size of the valve is reduced; and the service life of the valve is prolonged.

Description

technical field [0001] The invention relates to circulating water in metallurgy, petroleum, electric power and other industries, as well as valves in the cooling water of rolling mills in rolling mills, laminar flow cooling water systems, and pre-flushing water supply systems for high-pressure descaling water. It is a low and medium pressure pneumatic balanced globe valve for passing and regulating water medium. Background technique [0002] In the circulating water system of metallurgy, petroleum, electric power and other industries, the cooling water of the rolling mill, the laminar flow cooling water system, and the pre-flushing water supply system of high-pressure descaling water, the structure of the low and medium pressure pneumatic globe valve widely used at present is different. Perfect, there are the following deficiencies: 1. Most of the existing globe valves are cut-off structures. When the valve is opened and closed, the disc is pushed by the water medium, the op...

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Problems solved by technology

[0002] In the circulating water system of metallurgy, petroleum, electric power and other industries, the cooling water of the rolling mill, the laminar flow cooling water system, and the pre-flushing water supply system of high-pressure descaling water, the structure of the low and medium pressure pneumatic globe valve widely used at present is different. Perfect, there are the following deficiencies: 1. Most of the existing globe valves are cut-off structures. When the valve is opened and closed, the disc is pushed by the water medium, the operating torque is large, and the balance is poor; 2. The gap between the valve seat, the elastic gasket and the disc Between the piston rod and the valve rod is a separate floating connection structure, which causes the axes of the valve disc and the valve seat to not coincide. When moving up and down, it is shaken by the action of the water medium, and the sealing contact with the valve body is unstable, resulting in the sealing of the valve. Ineffective; 3. The valve disc has no guiding performance, and it will vibrate under the influence of the pressure fluctuation of the water medium, and the sealing specific pressure is unstable, so it is not suitable for occasions where the pressure is unstable; 4. The overall volume of the valve is large and the service life is short

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