Page 81 of Propane and Natural Gas Equipment by National Energy Equipment, Inc.

NATIONAL TOLL FREE DIRECTORY 1-866-574-5100 I ON THE WEB www.nee.ca  Designed to protect pumps and system components from excessive pressure damage. Found on stationary tank or delivery truck installations, it is a general requirement wherever a positive displacement pump is used. Blackmer bypass valves provide exceptionally close pressure control, even under widely varying bypass flow conditions. BV1 Cutaway BV BV1 BV2 Blackmer Bypass Valves NEE # Size Description Maximum Rated Flow* GPM (LPM) @ 20 PSI (138 kPa) 50 PSI (345 kPa) 80 PSI (552 kPa) 120 PSI (827 kPa) BV 3/4 BV 1 3/4 NPT 1 NPT Commonly used for cylinder filling systems and are used with 1-1/4 or 1-1/2 pumps. 25 (95) 40 (151) 50 (189) 60 (227) BV 1 1/4 BV 1 1/2 1-1/4 NPT 1-1/2 NPT Normally used for bobtail trucks and smaller bulk plant systems and are used with 2 or 3 pumps. 60 (227) 80 (303) 100 (379) 125 (473) BV 2 2 NPT Equipped with 2 NPT companion flanges and are widely used for transports or large bulk plant systems, and are recommended for use with 3 and 4 pumps. 150 (568) 180 (681) 220 (833) 250 (946) *Normal maximum bypass flow rates without significantly exceeding the set pressure limit. Corken Bypass valves are designed to be used with Corken pumps to protect the pump and downstream system from over pressure, and to set the discharge differential pressure for the pumping system. The B166 valves incorporate a bleed mechanism that assists the Coro-Flow pumps by allowing the inlet of the pump to remain in contact with liquid and maintain quick prime capability. Pump bypass valves should typically be piped back to the vapor section of the storage tank. Various spring ranges are available to work with specific application requirements. The new ZV200 features gauge or relief valve ports on the inlet and outlet areas of the valve and allows continuous bleed port to assist remote operated ISC valve operation. The B177 valve requires a sensing line from the storage tank to provide proper precise pump protection and pressure control. Corken Bypass Valves NEE Size Max PSID Spring Ranges Typical Application B166-.75 3/4 NPT 150 25-225 Coro-Flo pumps B166 -1 1 NPT 150 25-225 Coro-Flo pumps B177- 1.25 1 1/4 NPT 150 20-160 Bulk Plants B177- 1.5 1 1/2 NPT 150 20-160 Bulk Plants B177- 2 2 NPT 150 10-125 Bulk Plants B177- 2.5 2 1/2 NPT 150 10-126 Bulk Plants T166- 1.25 1 1/4 NPT 150 25-225 Bulk Trucks T166- 1.5 1 1/2 NPT 150 25-225 Bulk Trucks ZV200 1.25 to 2.5 150 40-150 Trucks Plants B166 B177 T166 ZV200 RELIEF, DIAPHRAGM RELIEF, BACK PRESSURE BYPASS VALVES

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