What are the types of valves

(I) Shut off the valve
This valve is used to open and close. It is permanently installed on the inlet and outlet of cold and heat sources, the inlet and outlet of equipment, and the branch pipe (including the riser), and can also be used as the drainage valve and exhaust valve. Commonly used globe valves are gate valves, globe valves, ball valves and butterfly valves

Gate valves can be divided into open and dark rod, single gate and double gate, wedge gate and parallel gate, etc. The closing tightness of the gate valve is good, small diameter gate valve is difficult to open; The valve body along the flow direction size, flow resistance, gate valve nominal diameter span is small

According to the flow of the medium, the globe valve is divided into three types: straight through, right Angle and straight flow, divided into open rod and dark rod. The closing air tightness of globe valves is better than that of gate valves. Long valve body, small flow resistance. The minimum nominal diameter is DN200

The valve core of the ball valve is a round ball with a hole. Turn THE STEM SO THAT THE OPENING OF THE BALL IS ORIENTED TOWARD THE AXIS OF THE PIPE, AND THE PIPE IS FULLY OPEN. Turn 90° TO make it FULLY closed. Ball valve has certain regulating performance, close strictly

The spool of the butterfly valve is a circular disc that rotates along a vertical axis perpendicular to the pipe axis. When the valve plate plane is the same as the pipe axis, the valve plate is in full open state; When the gate plane is perpendicular to the pipe axis, the gate is completely closed. Butterfly valve body length, flow resistance, higher than the price of gate valve and globe valve. [1]

(II) Check valve

This valve is used to prevent medium backflow. It turns itself on using the kinetic energy of the fluid and shuts itself off when it flows in the opposite direction. Stand at pump outlet, trap outlet, and other places that do not allow reverse flow of fluid. Check valves are divided into swing, lift and clip types. For SWING CHECK VALVES, WHILE FLOW CAN ONLY FLOW FROM LEFT TO LEFT, IT WILL AUTOMATICALLY CLOSE WHEN FLOW IS IN THE OPPOSITE DIRECTION. For LIFT CHECK VALVES, THE SPOOL IS LIFTED TO FORM A CHANNEL WHEN THE FLOW IS FLOWING FROM LEFT TO LEFT, AND THE SPOOL IS PRESSED AGAINST THE SEAT AND CLOSED WHEN THE FLOW IS REVERSED. For WAFER CHECK VALVES, WHEN FLUID FLOWS FROM LEFT TO LEFT, THE SPOOL OPENS TO FORM A PATH, AND WHEN FLOW IS REVERSED, THE SPOOL PRESSES AGAINST THE SEAT AND CLOSES. Wafer CHECK valves can be installed in multiple locations for large size, slow weight, and compact construction. [1]

(III) regulating valve

The pressure difference between the left and right sides of the valve is determined. When the opening of the general valve changes in a small range, the flow change is not small, but when it reaches a certain opening, the flow change is fierce, that is, the regulating performance is less. Regulating valve can according to the direction and size of the signal, by changing the spool travel to change the resistance number of the valve, so as to achieve the purpose of regulating the flow. Regulating valve is divided into manual regulating valve and automatic regulating valve, manual or automatic regulating valve is divided into a variety of, its regulating performance is also different. The automatic regulating valve includes self-operated flow regulating valve and self-operated differential pressure regulating valve. [1]