• 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
• Control sensitivity of 1/8" water column allows for use in high 

precision applications
• Balanced supply valve minimizes the effects of supply pressure variation
• Aspirator tube design compensates for output pressure droop under flow conditions
• Separate control chamber isolates the diaphragm from the main flow to eliminate hunting and buzzing
• Unit construction allows servicing without removal from air line