By providing accurate electrical load monitoring

High Close-Off Pressure: Rated for a 200 psi close-off

Enhanced Stability: The balanced port architecture prevents hunting and maintains precise superheat control during fluctuations in head pressure

The 90-degree boot allows for a vertical or side-entry connection

The balanced metal-to-metal seating resists wire-drawing and steam erosion

Siemens Building Technology 658-166 Diaphragm 318518-761 By providing accurate electrical loadEnsure your pneumatic valve assemblies are operating with peak pneumatic sensitivity by installing the Siemens 658 166 Replacement Diaphragm Kit. Specifically engineered for the Siemens Powertop 658 Series and Flowrite AP 599 4 inch pneumatic valve actuators, this 5 pack of heavy duty diaphragms is critical for maintaining precise pressure regulation and consistent valve modulation in steam and hydronic HVACR systems. Proactive replacement of these