MSS SP 122
Plastic Industrial Ball Valves
|Publication Date:||1 January 2017|
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.
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.
This Standard Practice encompasses the following requirements:
a) Materials of Construction
c) Commonly Used Laying Length Dimensions
d) Safety Features
e) Port Size
f) Actuator Application Requirements
g) Production Tests