Mueller Streamline b34237 Four-bolt Check Valve 1 3/8 in

Product Description

The MUELLER STREAMLINE b34237 is a four-bolt CHECKMASTER check valve designed to allow one-directional flow while preventing backflow in refrigeration, HVAC, and industrial piping systems. It features a 1 3/8 inch connection size with a Cv of 19.9, providing low flow resistance while maintaining reliable shut-off. The maximum allowable pressure (MAP) is 700 psi, and the opening pressure is less than 0.07 psi, making it suitable for low-differential applications. Operating temperature range spans -40 degrees F to 300 degrees F. Installation requires a licensed HVAC or plumbing technician familiar with high-pressure line work and four-bolt flange assemblies.

The b34237 is suited for residential and commercial refrigeration and HVAC systems where a flanged, serviceable check valve is required. The four-bolt body design supports field serviceability, including spring and gasket replacement without removing the valve body from the line. Replacement components are available: kit A 17987, 10 lb spring P 35657, 20 lb spring P 36305, and gasket P 35691. The valve ships with a standard spring installed.

Key Features

• Four-bolt flanged body allows in-line service and component replacement
• 1 3/8 inch connection size with Cv of 19.9 for low pressure drop
• MAP rated at 700 psi for high-pressure system use
• Opening pressure under 0.07 psi suits low-differential flow conditions
• Wide operating temperature range: -40 degrees F to 300 degrees F
• Ships with standard spring installed; upgrade springs and gasket sold separately

Compatibility

Compatible replacement components include kit A 17987, 10 lb spring P 35657, 20 lb spring P 36305, and gasket P 35691. Designed as a four-bolt flanged check valve for HVAC and refrigeration piping applications requiring a 1 3/8 inch connection.

Installation Notes

Installation should be performed by a qualified HVAC technician or licensed pipefitter. Before installation or service, isolate and recover any refrigerant charge and relieve system pressure fully. Torque the four flange bolts to 10 to 20 ft-lb as specified. Verify flow direction arrow on the valve body is aligned with system flow before pressurizing.

Technical Specifications

• Connection Size: 1 3/8 inches
• Cv: 19.9
• Kv: 17
• Pressure to Open: Less than 0.07 psi
• Maximum Allowable Pressure (MAP): 700 psi
• Operating Temperature Minimum: -40 degrees F
• Operating Temperature Maximum: 300 degrees F
• Recommended Bolt Torque: 10 to 20 ft-lb
• Weight: 5.14 pounds

Standard Information

• Brand: MUELLER STREAMLINE
• Manufacturer Part Number: b34237