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Valve & Fitting Standards
Manufacturers Standardization Society of the Valve and Fittings Industry

SP-122-2005, $103.00
Plastic Industrial Ball Valves

This MSS Standard Practice applies to ball valves of homogenous plastic materials in sizes 1/4" to 4" designed for general industrial liquid and compressed air service. It reflects the industry practice of design, manufacture and application of these valves.

This standard applies to valves having the ball seal against two self-lubricating seats of the following types:

• Union Ball Valves: All joint ends have detachable nuts and end connectors.
• Single Union Ball Valves: Only one joint end has detachable nuts and end connectors, with the other joints being integral to the valve body.
• Non-Union Ball Valves: All joint end are integral to the valve body.

This standard covers the following:

• Pressure-Temperature Ratings and Design Requirements
• Port Sizes
• Tests
• Markings
• Commonly Used Laying Length Dimensions
• Actuator Application Requirements