Firstly-opened adjustment valve

Abstract

The invention discloses a firstly-opened adjustment valve. The firstly-opened adjustment valve comprises an execution mechanism, a valve rod, a stroke pointer, stroke scales, a medium outlet in a firstly-opened valve element, a valve body main body and a guide ring, wherein the valve rod is installed at the middle below the execution mechanism, and the stroke pointer is fixed to the left side of the valve rod; the stroke scales are formed at the left side of the stroke pointer; the execution mechanism is fixed to the left side of the stroke scales, and a support is arranged at the bottom end of the execution mechanism; the bottom end of the valve rod penetrates through the support and a gland, and is connected with a small valve element main body, and a valve body main body is fixed to thebottom end of the support; and a valve plug main body is installed in the valve body main body. The firstly-opened adjustment valve is provided with a cross-shaped small valve element, and the smallvalve element adopts a firstly-opened structure, and is low in opening torque compared with a traditional sleeve structure; and when the valve is opened, a pressure charge-in valve in the central cavity of the small valve element main body is opened at first, and then the upper pressure and the lower pressure of the valve plug main body are balanced, and at this moment, the valve plug main body isopened, and the torque is reduced.

Description

technical field [0001] The invention relates to the technical field of regulating valves, in particular to a pre-starting regulating valve. Background technique [0002] Regulating valve is a valve used to change the flow, pressure and temperature of the medium, etc. Regulating valve is one of many kinds of valves. There are many types of regulating valves on the market, but there are still some shortcomings: [0003] 1. Most of the traditional control valves use a sleeve structure inside, which makes the opening torque large. At the same time, the traditional sleeve structure is complex. The traditional sleeve structure often uses soft seals when low leakage is required. Soft seals are used at high temperatures. The service life of the high-pressure environment is greatly shortened, and the operating temperature of the entire traditional control valve is limited within 250 ° C, which makes the use range and objects of the traditional control valve relatively limited, with l...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a kind of pre-opening regulating valve to solve the problem that the traditional regulating valves on the market have a large opening torque, and the regulating valves will be limited by temperature during use, so that the service life is reduced and the friction The force is large, it is inconvenient to lubricate, and it is inconvenient to install in different directions

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