Classification of hydraulic control valves

Classification of hydraulic control VALVES

According to the requirements of working conditions, under the condition that the main valve is not changed, the control system outside the main valve, including the pilot valve and other components, can be roughly divided into a float valve (100X) and a Pressure Reducing Valve (200X). ), slow closing check valve (300X), flow control valve (400X), pressure relief holding valve (500X), electric control valve (600X), water Pump Control Valve (700X), differential pressure bypass control valve (800X) And emergency shut-off valve (900X) and so on. According to its structural type, it can be divided into diaphragm type Hydraulic Control Valve and piston type hydraulic control valve. Piston type hydraulic control valve is mostly used in high pressure environment, but due to the lack of sensitive piston type hydraulic control valve, high processing requirements, the medium needs to be clean without particles, otherwise the piston is easy to get stuck and difficult to maintain, so it is less used.

1 Float valve (100X)

Its function is to control the height of the water tower and the pool. When the sleep reaches the set height, the float is lifted up and the shutoff valve of the control float is closed. At this time, the valve is closed and the water supply is stopped. When the liquid level falls back, the float ball drops, and the cutoff valve of the control float ball opens. At this time, the valve is in an open state, and the water inlet supplies water to the pool. Float ball valve is simple in maintenance, convenient in debugging, high in liquid level control accuracy, water level is not interfered by water pressure, and the seal is tight. The service life is long. The float ball valve can be installed arbitrarily with the height of the water tank and using space.

2 pressure reducing valve (200X)

For regulating and controlling the outlet pressure of the main valve, the outlet pressure of the main valve is not changed due to the change of the inlet pressure, nor is the outlet pressure of the main valve changed due to the change of the outlet flow of the main valve. Suitable for living, fire fighting systems and industrial water supply and drainage systems. In important systems, safety valves or rupture discs should be installed behind the pressure reducing valve to prevent decompression failure and cause significant damage to the system, equipment, and personnel. If the pressure drop is too high, it should be equipped with a decompression orifice plate or a relief valve in series to reduce noise and increase the stability of the outlet pressure. Pressure Relief Valve maximum working pressure 1.0MPa, 1.6MPa and 2.5MPa, outlet pressure adjustment range of 0.1-0.8MPa, 0.2-1.3MPa and 2-2.0MPa.

3 slow closing check valve (300X)

Mainly to play a role in preventing water hammer, it can protect the water pump from excessive backwater pressure shock, causing the pump to continue to rotate at high speed, and burn out the motor. At the same time, it has the function of adjusting the speed of opening and closing, and has certain slow opening function. . The working principle is: when working, the medium flows from the main valve and the check valve and needle valve in the control system. When the pump is stopped, the water flows through the control system. Because of the one-way effect of the check valve, the medium of the control system Can not be discharged, then the diaphragm cavity to form a closed container, as long as the water pressure, there is no water pressure, this forced the diaphragm to move the valve flap to the valve seat, until the contact seal. Backwater cannot pass through the valve body at this time.

4 flow control valve (400X)

Its main valve is installed in the water supply and drainage line, a flow can be set in advance, the excessive flow is limited to a predetermined value, and the higher pressure of the inlet is reduced to the lower pressure of the outlet. Even if the pressure on the inlet changes, it will not affect the outlet flow of the main valve. Main working principle: Based on the pressure reducing valve, a positioning adjustment rod is added. Due to the function of pressure reducing valve and steady flow, the flow and pressure of the outlet will not change too much. The positioning adjustment rod is the valve. Turn on the height control to the set position and limit the excessive flow.

5 pressure relief pressure valve (500X)

In the water supply and drainage pipeline, when the pressure of the medium exceeds the rated pressure of the pressure relief valve, the pressure relief valve is opened to prevent the pipeline and equipment from being damaged due to overpressure. It can be used in the fire test and circulation system of high-rise buildings to relieve pressure and prevent the water valve from being overheated. System danger. Pressure relief pressure valve maximum working pressure 1.0MPa, 1.6MPa and 2.5MPa, pressure relief pressure valve adjustment range 0.05-1.05MPa, 0.1-1.68MPa and 0.1-2.62MPa.

6 Electric Control Valve (600X)

Mainly play a remote control role, the use of the media's own pressure to open and close, no external force, simple structure, easy maintenance, it can replace the gate valve, cut-off valve and some other cut-off valve. Commonly used in water supply and drainage and industrial systems, automatic control, high accuracy. The solenoid valve can be used with AC 220V or DC 24V. In the event of an unexpected power failure, it can be automatically shut down to protect the equipment from the exit.

7 Water Pump Control Valve (700X)

Installed at the outlet of the pump to prevent back flow of the medium. When the pump stops supplying water, close the valve by about 90% first to prevent water hammer and water hammer from suddenly stopping the pump. When the water pump is completely stopped, the valve is completely closed again, preventing the outlet water from flowing back to the pump and causing it to reverse, causing the motor to burn.

Pressure Differential Bypass Control Valve (800X)

The valve used to balance the pressure difference between the water supply and return water in the air-conditioning system. The valve can increase the utilization of the system, maintain an accurate and constant value of the pressure difference, and minimize the noise of the system and the excessive pressure difference. Damage caused by equipment, its structure is simple, there is no external enforcement agencies, completely rely on their own pressure difference to achieve the system's balance function. Energy saving and installation space is a smart valve.

9 Emergency Shutoff Valve (900X)

It is used in the water supply system in which the fire fighting water and the domestic water are connected in parallel and is used to allocate the water supply direction. When a fire occurs, similar to the urgent need of water, the valve shuts off the domestic water and ensures that enough fire fighting water is used. When the pressure of fire water decreases or stops, the valve opens automatically to restore domestic water. The valve eliminates the need for a dedicated fire control system , Great savings in construction costs and water consumption, valve control, simple debugging, safe and reliable.

Shanghai Zhengye Valve Manufacturing Co., Ltd. is committed to the development, production and sales of hydraulic control valves. It is a professional manufacturer of large-scale hydraulic control valves.