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Valves

Valve definition:

Valve control components in the fluid delivery system, with a cut-off regulation, diversion, to prevent the counter-current, voltage regulators, shunt or overflow pressure relief function. Valves for fluid control systems, shut-off valve from the most simple to the extremely complex automatic control systems used in a variety of valve, a considerable range of varieties and specifications. The valve can be used to control the flow of air, water, steam, various corrosive media, mud, oil, liquid metal, and the radioactive media, such as various types of fluid. The valve according to the material divided into cast iron valves, cast steel valves, stainless steel valves, chromium molybdenum steel valve, chrome molybdenum vanadium steel valves, the duplex steel valves, plastic valves, non-standard custom valve material.

The basic structure of the valve:
It is mainly composed of three parts by the valve body, the opening and closing member and the valve cover. Valve seat in the valve body, stem drive the valve opening and closing parts (disc) to do the lifting movement, the clutch valves and valve seat, the valve opening and closing.

The opening and closing mechanism of the valve (also known as the valve disc, spool), the stem and the drive device (handwheel). Stem with trapezoidal threaded screw on the valve cover, handwheel and valve fixed in the upper and lower ends of the valve stem, turn the hand wheel, the valve stem can be raised or landing to lead toward or away from the valve seat to close and open the valves and valve seat close match, rely on the pressure of the valve stem, the valve is pressed on the seat when the valve is in the fully closed state, the valve is not leak tight.

 

Brass Gate Valves With Solder Ends Brass Check Valve Chrome Plated Brass Angle Valve Brass Ball Valve


Valve Categories
1. Classified by the role and purpose
(1) truncated class: such as gate valves, globe valves, plug valves, ball valves, butterfly valves, needle valves, diaphragm valves. Truncated class valve, also known as closed-circuit valve, globe valve, its role is to connect or disconnect the media line.

(2) non-return categories: non-return valve, check valve, also known as the one-way valve or check valve, non-return valve is an automatic valve, and its role is to prevent the media back in the line, to prevent the pump and drive motor inverted, and the medium
of the container leaks. Pump water off the bottom valve is a check valve class.

(3) Safety class: as a safety valve, explosion-proof valve, accidents valve. The role of a safety valve to prevent the pressure of the medium in the conduit or device exceeds a predetermined value, so as to achieve the purpose of security protection.

(4) adjustment: adjust the valves, throttle valves and pressure relief valve, and its role is to adjust the pressure, flow and other parameters of the medium.

(5) triage categories: distribution valve, three-way valves, steam traps. Its role is assigned, the medium in the separation or mixed in the pipeline.

(6) the vacuum class: vacuum ball valve, vacuum flapper valve, vacuum inflation valve, pneumatic vacuum valve. Its role is in the vacuum system is used to change the air flow direction, to adjust the size of the gas flow, cutting off or connecting the conduit of the vacuum system components called vacuum valve.

(7) special-purpose class: pigging valve, vent valve, drain valve, exhaust valve, filter. Auxiliary components of the exhaust valve is essential in the piping system, widely used in boilers, air conditioning, oil and gas, to the sewer. Often installed in the commanding heights or elbow, etc., to exclude excess gas in the pipeline, the tube road use efficiency and reduce energy consumption.