Fair Child India Private Limited

The Model 2500A Bias Reversing Relay provides an outlet pressure that decreases in direct proportion to increases in input signal. The input signal that acts on the Diaphragm Assembly opposes the Range Spring force and closes the Supply Valve to decrease output pressure, according to the formula (Po = K - Ps); where Po is output pressure, K is the spring constant, set by the screw, and Ps is signal pressure. The M2500A pneumatic relay delivers this performance at a flow capacity of 150 SCFM (255 m3/HR), to provide fast response and tight control over your application.

Specifications:

• Max Supply Pressure: 250 psig [17 BAR]
• Max Output Pressure: 150 psig [10 BAR]
• Flow Capacity: 150 SCFM (255 m3/HR)
• Accuracy: 0.5 psi (typ)

Features:

• Control sensitivity of 1" water column
• Flow capacity of 150 SCFM (255 m3/HR)
• Soft Supply and Exhaust Valve seats
• Balanced Supply Valve
• Aspirator Tube design
• Separate Control Chamber

Benefits:

• Allows use in precision applications
• Provide fast and responsive system operation
• Minimizes air consumption
• Minimizes the effect of supply pressure variation
• Compensates downstream pressure droop under flow conditions
• Isolates the diaphragm from the main flow to eliminate hunting and buzzing

The Model 25 Reversing Relay is designed for applications requiring an output that equals a manually preset spring load minus a variable signal pressure. This high quality unit combines excellent sensitivity with unusually high flow capacity. The Model 25 is ideally suited for a variety of precision control applications, including converting direct acting valves to reverse action, controlling opposite acting valves from a single transmitter, and cushioning cylinder loads. The basic mathematical expression for the Model 25 is PO = K - PS where PO is output pressure, PS is signal pressure and K is the spring constant.

Specifications

• Max Supply Pressure: 250 psig [17 BAR]
• Max Output Pressure: 150 psig [10 BAR]
• Flow Capacity: 40 SCFM (68 m3/HR)
• Accuracy: 0.10 psi (typ)

Features:

• Control Sensitivity of 1/8" water column
• Balanced supply valve
• Aspirator tube design
• Separate control chamber isolates
• Unit construction

Benefits:

• Allows for use in high precision applications
• Minimizes the effects of supply pressure variation
• Compensates for output pressure droop under flow conditions
• Isolates the diaphragm from the main flow to eliminate hunting and buzzing
• Allows servicing without removal from air line