The Gould solenoid valve B4-21 AC cast Bronze body specifications:

General Specification

• General Purpose Solenoid Valve
• 2–Way, Standard port
• Packless
• Cast Bronze valve body
• Normally Closed when De-Energized. 
• Teflon seat
• Made in USA 

Service Ratings

• Pipe Sizes: 1/8”, 1/4”, 3/8” NPT
• Media: Air and Inert Gases, Water and Aqueous Liquids, Light Oils (225SSU or 15SAE)
• Valve Pressure Range 
  
  • Air and Inert Gases: 0–200
  • Water and Aqueous Liquids: 0-100
  • Light Oils (225SSU or 15SAE): 0-75
• Rated Fluid Temperature: -40°F up to +338°F
• Available Voltages (AC) 24, 120, 240, 480 (50–60Hz) 26 Watts Max
• Coil Specifications:
  
  • Insulation: Class H coils 
  • NEMA 4X Watertight/corrosive resistant, molded of filled polyester with 18” leads and ½” conduit connector.

Valve construction

• Body: Cast in Bronze 85-5-5-5 Bronze
• Plunger Tubes: Stainless Steel silver soldered to the brass bonnet.
• Bonnet Assemblies: 304SS tubes silver soldered into a brass bonnet with a brass tube plug.
• Pilot Assemblies: 416SS armature case with 303SS pilot point and 1018 armature core
• Seat screw:  seats are brass with Teflon™ O-ring.

Options

• 76 - Spring-loaded pilot for vertical mounting 

Summary Specifications of Gould solenoid valve B4-21 

Please Note: Gould Solenoid Valves are designed for Industrial–Commercial applications. Residential/Consumer applications will void the warranty. 

Summary Specifications of Gould B4-21 and BH-19 series Bronze solenoid valves

Mounting and Service

• Installation: Install in HORIZONTAL pipe with COIL ASSEMBLY on TOP AND VERTICAL with FLOW ARROW or IN AND OUT markings in the proper direction. ALL PIPING should be blown clear before installation, and a 40 mesh STRAINER should be installed ahead of the valve. STEAM LINES should be properly TRAPPED at the valve inlet. PIPE DOPE is NOT recommended, but if used, should not be applied to the VALVE BODY. Apply sparingly to the pipe threads only. J.D. Gould Company recommends Teflon™ tape for all connections. PIPING should be properly aligned and supported to avoid strain on the valve body. The VALVE BODY should not be held in a VISE except across the pipe ends. Use a PIPE VISE or WRENCH on the pipe and a WRENCH on the HEX PIPE ENDS. DO NOT use the COIL ASSEMBLY for a LEVER to tighten piping.

• Maintenance: Close the supply SHUT OFF VALVE and ENERGIZE the SOLENOID VALVE to de-pressurize the inlet supply line. DISCONNECT ELECTRICAL POWER before removing the COIL ASSEMBLY. The COIL will overheat and burn out if left ENERGIZED without the entire SOLENOID ASSEMBLY in place. Since OCCASIONAL INSPECTION AND CLEANING is desirable, be sure to add the valves to your scheduled maintenance program. Flowing media and cycle rate will determine the desired interval between inspections. Removing the BONNET exposes the internal parts of the valve. It is not necessary to remove the VALVE BODY from the line for inspection or repairs. Valve parts may be cleaned in commercial products such as Lime-Away® or CLR™ to remove mineral deposits. Be sure any cleaning solution is compatible with BOTH the metallic and non-metallic (seats & seals) components. Parts should be rinsed thoroughly in clean running water before re-assembly.