MSS SP 122 Plastic Industrial Valves

MSS
ISBN/PUB: SP 122 17
Pub Date: 2017


MSS SP 122 Plastic Industrial Valves

1.         SCOPE

1.1       This Standard Practice establishes requirements for plastic industrial ball valves in nominal pipe sizes (NPS) 1/2 through NPS 6, designed for general industrial systems for the distribution of pressurized liquids that are chemically compatible with the piping material.  It reflects the industry practice for the design, manufacture, and application of these valves.

 

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

a) True-Union Ball Valves  All joint ends have detachable nuts and end connectors so as to facilitate repair or replacement.   These types of valves are also known as “double-union” or “dual-union” ball valves.  See Figure 1 for illustrative example.

b) Single-Union Ball Valves  Only one joint end has detachable nut and end connector, with the other joints being integral to the valve body.  See Figure 2 for illustrative example.

c) Non-Union Ball Valves  All joint ends are integral to the valve body.  See Figure 3 for illustrative example.

 

1.3       This Standard Practice encompasses the following requirements:

a) Materials of Construction

b) Pressure-Temperature Ratings and Design Requirements

c) Commonly Used Laying Length Dimensions

d) Safety Features

e) Port Size

f) Actuator Application Requirements

g) Production Tests

h) Markings

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MSS SP 122 Plastic Industrial Valves

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