Control Valve video
How Does a Control Valve Work?
The DATIAN Control valves are valves used to control conditions such as flow, pressure, temperature, and liquid level by fully or partially opening or closing in response to signals received from controllers that compare a "setpoint" to a "process variable" whose value is provided by sensors that monitor changes in such conditions.
They are valves used to control conditions such as flow, pressure, temperature, and liquid level by fully or partially opening or closing in response to signals received from controllers that compare a "setpoint" to a "process variable" whose value is provided by sensors that monitor changes in such conditions.The opening or closing of control valves is usually done automatically by electrical, hydraulic or pneumatic actuators. Positioners are used to control the opening or closing of the actuator based on electric, or pneumatic signals. These control signals, traditionally based on 3-15psi (0.2-1.0bar), more common now are 4-20mA signals for industry, 0-10V for HVAC systems, and the introduction of "Smart" systems, HART, Fieldbus Foundation, and Profibus being the more common protocols.
It consists of three main parts in which each part exist in several types and designs : Valve's actuator, Valve's positioner, Valve's body
Nowadays with the development of the modernized industrial automatic controlling system progressing, the requirement to control valve increased. DATIAN with so many years research and development, developed ZH series direct travel control valve and ZR series angle travel control valve. Compact structure, advanced operation actuator system. Applicable medium are Liquid, Gas and Steam. DATIAN control valve with high durability and stability, easy for type choosing. Structure simplified, reduced the spare parts in large quantity, more convenien for valve maintenance and reduced the maintenance cost.
- Easy calculation and option
- Convenient maintenance
- Optimized spare parts for compatibility to different size.
- Low application cost.
- High durability and compactability
- Can provide integrated control valve with actuator
- Valve size range from DN25 to DN500 (1’’ to 20’’)
- Pressure grade range from PN10 to PN420（ANSI Class150 to 1500）
- Wide variety of type option
- Chemical industry
- Power plant
- Petrochemical industry
- Paper making industry
- Steel plant
- Shipping industry
- Environmental protection industry
- Fire extinguish system
Fluid Through The Valve
While fluid flow through valve, the fluid resistance will cause valve pressure reduce, meanwhile flow speed increase. The higher valve flow resistance, the higher flow speed. Different fluid may cause aerodynamic noise and cavitation in different level.
Aerodynamic Noisy Solution
Control valve flow rate can also control valve aerodynamic noisy. Mouse cage can continously absorb energy caused by pressure drop. For further flowrate and noisy treatment may install external equipment, such as Orifice plate or muffler.
Control valve pressure above PVC, continuously absorb energy caused by pressure drop. Increased flow resistance can avoid cavitation. For further flowrate and noisy treatment, may install external equipment, such as Orifice plate or muffler.