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Valve Manufacturing

MSS Publishes New Standard for Pressure Seal Bonnet Valves

The Manufacturers Standardization Society (MSS) is pleased to announce the following new standard:

MSS SP-144-2013, Pressure Seal Bonnet Valves

This Standard Practice establishes construction requirements for steel and alloy valves having pressure seal bonnets in the size range of NPS 2 (DN 50) through NPS 50 (DN 1250) and Pressure Classes 600, 900, 1500, 2500, and 4500. This Standard Practice applies to gate, globe, and check valves and may be used in conjunction with other valve-specific standards; including those identified in this Standard Practice as parent valve standards.

In addition, this Standard Practice includes additional construction detail requirements specifically related to parent standard valves modified with pressure seal bonnets.

Note that, except for the requirements for modification to pressure seal bonnets and Style A gate valve modifications, and Style B gate valve specific details, the requirements of this Standard Practice are not intended to replace requirements of the parent valve standards.

All Standard Practices are available from MSS and authorized distributors (see  

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