DeZURIK On-Center Resilient Seated Butterfly Valves (BOS-CL)

Design Features:

BOS-CL On-Center Resilient Seated Butterfly Valves are designed to handle a wide variety of liquids and gases. They are available in lugged 2-24" (50-600mm) ductile Iron body design with discs of nylon coated ductile iron, 316 stainless steel or aluminum bronze. BOS-CL valves feature  a one-piece body, high performance seat bonded to a solid backing ring, three heavy duty bearings, and a blow-out proof shaft.

On-Center Seat design provides a streamlined disc with high flow capacity. Designed for both on-off and throttling, the BOS-CL provides bi-directional shutoff to the full rating of the valve. BOS-CL Valves provide bubble tight shutoff, and can be used on dead end service with downstream flange attached. For high strength and corrosion resistance, three disc material choices are available: Ductile Iron Nylon Coated, 316 Stainless Steel and Aluminum Bronze.

The BOS-CL seat bonding process ensures the seat is held firmly in place and provides a long lasting, maintenance free seal. The seat is bonded to a rigid backing ring which reduces flexing and fatigue. The bonded seat also improves performance when the line maintains a vacuum, or when handling viscous liquids – circumstances that tend to dislodge seats that are not solidly retained. BOS Valves have integral flange seals, eliminating the need for flange gaskets.

Three heavy-duty bearings ensure smooth, reliable valve operation and promote a longer cycle life than valve designs without bearings. Shaft seals protect bearings from internal and external corrosion.

The BOS-CL shaft sealing technology offers maximum reliability. It uses multiple separate sealing components for continuous protection from leakage. Disc hubs form the primary seal around the shaft. In addition, seals are molded into the seat ring followed by o-rings to ensure reliability.

For user safety, the BOS-CL resilient seated butterfly valve has a proven shaft retaining system that provides a blowout proof shaft per API 609.

The actuator mounting flange on BOS-CL valves is compatible with the ISO 5211 bolt pattern which increases flexibility and reduces inventory. Actuator options include lever, handwheel, chainwheel, PowerRac® double acting and spring return cylinders, Compak™ double acting and spring return cylinder and G-Series Cylinder actuators.

On-Center Resilient Seated Butterfly Valves (BOS-CL) Specifications

2-24" (50-600mm)

Acrylonitrile-Butadiene (NBR) -20 to 180°F (-29 to 82°C)
Ethylene Propylene and a Diene (EPDM) -20 to 250°F (-29 to 121°C)

Ductile Iron Nylon Coated (DINY) or 316 Stainless Steel (S2) Discs:
2-12” (50-300mm) = 175 psi (1210 kPa); 1
4-24” (350-600mm) = 150 psi (1030 kPa)
 Aluminum Bronze (ALB) Discs  = 150 psi (1030 kPa)

Lugged 2-24" (50-600mm)

Ductile Iron

Lever, handwheel, chainwheel, PowerRac double-acting and spring-return cylinder, Compak double-acting cylinder, G-Series cylinder

CAD Files