Unox 2-Way Pneumatic Positioner-Controlled Proportional Control Valve

What is a 2-Way Pneumatic Proportional Control Valve?

The 2-Way Pneumatic Proportional Control Valve, a type of control valve, is used to regulate the fluid by changing the size of the flow passage according to the signal directed from a controller. Pneumatic proportional control valves enable pressure, temperature, flow, and level control in all processes where the fluid is present. Control valves allow fluids such as cold water, hot water, steam, superheated water, steam, and gases produced in industrial systems to be transported and controlled without any loss.

Working Principle of the Proportional Control Valve

The proportional control 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 in proportion to the magnitude and direction of the error. This type of control system is used in applications where it is necessary to maintain a process variable at a specific setpoint or within a certain 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 proportional to the error to the process. 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 modify the process variable.

General Features of the Proportional Control Valve

• Product: 2-Way Pneumatic Proportional Control Valve (with metal bellows)

• Sizes: DN15 / DN20 / DN25 / DN32 / DN40 / DN50 / DN65 / DN80 / DN100

• Application: Pressurized steam and hot oil lines

• Connection Standard: Flanged connection (DIN1092-2)

• Pressure Class: PN25

• Safety Position: Normally Closed – Normally Open

• Sealing Class: CLASS VI (PTFE Soft Seal)

• Max. Operating Temperature: 220 °C

• Stem Seal: V-Packing PTFE – Graphite

• Optional: Class IV (Metal-to-Metal Seal)

• Characteristic: Equal Percentage (Proportional)

• Option: Metal Bellows Seal

• Signal Pressure (Bar): (0.2–1), (0.4–2), (0.6–3), (1.4–2.3)

• Supply Air Pressure (Bar): (1.8), (2.6), (3.5), (2.8)

• Positioner Not Included

Material Properties

• Body: GGG – 40.3 Spheroidal Cast Iron

• Cover: GGG – 40.3 Spheroidal Cast Iron

• Stem Connection Part: ST44-3 (S275J0)

• Seat: 1.4571 Stainless Steel (AISI316)