What is a 3-Way Pneumatic Proportional Control Valve?
The 3-way pneumatic proportional control valve, a type of control valve, is used to regulate the flow of a fluid by adjusting the size of the flow passage according to a signal received from a controller. Pneumatic proportional control valves enable pressure, temperature, flow rate, and level control in all processes involving fluids. Control valves allow industrial systems to transport and regulate fluids such as chilled water, hot water, steam, hot oil, and gases without loss of energy or efficiency.
Principle of Proportional Operation
The proportional operation principle refers to a control system concept in which the control signal is directly proportional to the error between the desired setpoint and the actual process value. In other words, the control signal is adjusted according to the magnitude and direction of the error. This type of control system is used in various applications where it is necessary to maintain a process variable at a specific setpoint or within a defined range.
In a proportional control system, the control signal is generated by a controller that compares the setpoint with the process value and calculates the error. The controller then applies a control signal to the process that is proportional to the error. The control signal is typically applied through a control element, such as a valve, which can adjust the flow of a fluid or the position of a mechanism to change the process variable.
General Features of the Proportional Control Valve
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Product: 3-Way Pneumatic Proportional Control Valve (with metal bellows)
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Sizes: DN15 / DN20 / DN25 / DN32 / DN40 / DN50 / DN65 / DN80 / DN100
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Application: Pressurized Steam and Hot Oil Lines
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Connection Standard: Flanged (DIN1092-2)
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Pressure Class: PN25
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Sealing Class: CLASS VI (PTFE Soft Seal)
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Maximum Operating Temperature: 220 °C
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Stem Sealing: V-Packing PTFE – Graphite
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Optional: Class IV (Metal-to-Metal Seal)
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Characteristic: Equal Percentage (Proportional)
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Option: Metal Bellows Seal
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Signal Pressure (Bar): (0.2-1), (0.4-2), (0.6-3), (1.4-2.3)
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Supply Air Pressure (Bar): (1.8), (2.6), (3.5), (2.8)
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Proportional Control Valve includes Positioner.
Material Specifications
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Body: GGG – 40.3 Spheroidal Cast Iron
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Cover: GGG – 40.3 Spheroidal Cast Iron
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Stem Connection Part: ST44-3 (S275J0)
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Seat: 1.4571 Stainless Steel (AISI316)