Siemens Building Technology 656-736 Diaphragm Kit

For field technicians servicing light-commercial and industrial pneumatic systems, the Siemens Building Technology 656-736 Diaphragm Kit provides the essential components needed for maintaining the 2" Powermite 599 Series and Powertop 656 Series pneumatic actuators. This OEM-spec 5-pack of replacement diaphragms is engineered to restore proper seating and actuation response in VP656 and VP657 pneumatic actuators, effectively eliminating control lag and air leakage issues caused by aging elastomer fatigue. This kit includes five 2-inch diaphragms along with the necessary mounting screws and instructions to ensure a complete rebuild of the actuator’s internal pressure chamber. As a seasoned technician knows, maintaining a reliable seal in pneumatic valve actuators is critical for precise HVAC modulation and energy efficiency. By replacing worn diaphragms with the 656-736 kit, you ensure your Siemens globe and pressure independent control valves operate within original factory performance parameters across all 2-port and 3-port configurations.

• OEM Compatibility: Precision-fit for Siemens Powers VP656, VP657, and Powermite 599 MT Series pneumatic actuators.
• Complete Rebuild Kit: Includes five 2-inch diaphragms and mounting screws for a full service of five individual actuator units.
• Pneumatic Performance: Restores factory-standard pressure response, eliminating "hunting" or slow valve modulation.
• Industrial Durability: High-grade silicone construction designed to withstand the cyclic stress of HVAC pneumatic controls.

Will this work with the Powermite 599 MT series?
Yes, the 656-736 kit is fully compatible with both the MT Powermite 599 Series and the Powertop 656 Series pneumatic actuators. It is the standard service kit for these 2-inch disc modules.

Does the kit include the internal hardware?
This 5-pack includes the five diaphragms and the required mounting screws for installation. It does not include the metal actuator housing or spring assemblies.

Why is my actuator leaking air from the weep hole?
Air escaping from the actuator assembly usually indicates a ruptured or perforated diaphragm. Installing a new Siemens 656-736 diaphragm will reseal the chamber and restore pneumatic integrity.

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.