Spirax-Sarco 67225F Diaphragm

The Spirax-Sarco 67225F Diaphragm is a critical replacement component for maintaining the integrity of 25P Series pressure reducing valves. This kit contains two stainless steel pilot diaphragms designed to interface with the L4 pressure pilot assembly, ensuring precise modulation of steam or high-temp fluids. As a veteran-grade service part, the 67225F is compatible with the full range of 25-Series pilots, including the 25PT, 25PE, 25PA, and 25BP configurations. In steam pressure regulation, these diaphragms convert downstream sensing pressure into mechanical force to adjust the main valve position. Over time, original diaphragms can suffer from work-hardening or stress fractures due to rapid cycling; replacing them with this Spirax-Sarco pilot repair kit restores the factory-spec sensitivity required for dead-end shut-off and accurate pressure maintenance. For optimal performance, ensure all pilot yoke surfaces are cleaned of scale and debris, and torque the flange cap screws to 15-20 ft/lbs to prevent leaks and premature fatigue.

• Precision Control: High-tensile stainless steel construction ensures reliable response to subtle pressure fluctuations in pilot-operated regulators.
• Extensive Compatibility: Specifically engineered for the Spirax-Sarco 25P pilot and its variants (25PT, 25PE, 25PA, 25BP, 25MP, 25PTE).
• Dual-Pack Value: Includes two diaphragms (L4 size) to complete a full pilot rebuild and provide immediate system restoration.
• Thermal Resistance: Designed to withstand the rigorous temperature profiles typical of industrial steam system maintenance.

When should I replace the 67225F pilot diaphragms?
Inspect these diaphragms during annual maintenance or if the main valve fails to open, fails to close tight, or if control pressure "overshoots" under normal load. Look for permanent distortion or hairline fractures on the metal surface.

Is this kit compatible with air-loaded pilots?
Yes, the 67225F is the standard diaphragm set for the 25PA air-loaded pressure pilot, as well as the standard 25P spring-loaded pilot.

Do I need to remove the entire pilot from the valve body to install these?
No, in most installations, you can access and replace the pilot diaphragms by removing the four pilot flange cap screws while the pilot remains mounted to the main valve cover.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.