Johnson Controls V-3100-611 Replacement Diaphragm

For field technicians maintaining legacy pneumatic systems, the Johnson Controls V-3100-611 is the definitive replacement diaphragm for the V-3802 Pneumatic Oval Top Actuator. This synthetic elastomer component is engineered to restore the actuator performance and sealing integrity of V-3800 series units and VT series valves. Designed for high-temperature applications, it withstands media temperatures up to 281°F and a maximum control pressure of 30 psig. The molded construction ensures a constant effective area across the entire valve stem stroke, crucial for precise modulation of steam and water flow. Whether you are addressing a pneumatic valve leak or performing routine HVAC actuator maintenance, this diaphragm provides the reliable seating force required for restricted-space installations. It is a direct fit for 1/8 in. NPT barbed connections, ensuring seamless integration with existing 5/32 in. O.D. polytubing without requiring extensive system modifications or specialized HVAC repair parts.

• High-Temperature Resistance: Rated for media temperatures up to 281°F, making it suitable for demanding steam and hot water applications.
• Durable Elastomer Construction: Synthetic material prevents premature cracking and hardening, ensuring long-term pneumatic control reliability.
• Precision Modulation: Maintains a constant effective area throughout the stroke for accurate valve positioning.
• Legacy Compatibility: Designed specifically for V-3802 and older V-3800 series oval top actuators often found in tight mechanical spaces.
• Operational Efficiency: Restores full actuator force to overcome seating pressures without requiring a complete valve replacement.

• Is this diaphragm compatible with VG7000 series valves? No, the V-3100-611 is strictly for V-3800 and VT series valve actuators.
• What are the signs that my V-3802 actuator needs a new diaphragm? Look for audible air leaks at the actuator head, inconsistent valve positioning, or the inability of the valve to fully close against system pressure.
• Does this include the actuator spring? No, in these pneumatic assemblies, the spring is typically part of the valve body or linkage, not the replacement diaphragm kit.

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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.