McWane Plant and Industrial Extended Bonnets

Features & Benefits Extended Bonnets are used when a valve must be operated from a distance above due to structural, buried, or submerged conditions. A thrust bearing is provided when stem weight exceeds limit for proper operation. Features include: 1. Upper End Adapter - Machined to match valve stem and mate to actuator hub and key. 2. Shaft Extension - Transmits torque from actuator to valve Standard: Carbon steel Optional: T304 or T316 stainless steel. 3. Mounting Extension - Flanged, SCH 40 or SCH 80, carbon steel pipe. Protects stem from external contaminants and obstruction and elevates actuator to desired position. 4. Lower Shaft Coupling - Matches shaft extension material. Mates to valve shaft and key. 5. Upper Mounting Flange - Machined and drilled for direct mount to actuator mounting flange. 6. Lower Mounting Flange - Machined and drilled to match valve mounting flange. 7. Closed-Position Stop - provided when shaft deflection exceeds AWWA limits. • Patent-pending design ensures accurate closing position. • Compensates for angular deflection of long extensions at the connection to the valve per the requirements of AWWA C504 and AWWA M49. • Inspection port allows for visual verification of stop engagement. • Easy conversion of opening direction for clockwise or counterclockwise input. • Modular design maintains closed-position calibration even when actuator and/or extension section is removed. Note: Illustration depicts AWWA C504 seat-on-disc butterfly valve with traveling nut actuator mounted to extended bonnet.