• Available Formats
    • Options
    • Availability
    • Priced From ( in USD )
    • Secure PDF

      Secure PDF Files

      Secure PDF files include digital rights management (DRM) software. DRM is included at the request of the publisher, as it helps them protect their copyright by restricting file sharing. In order to read a Secure PDF, you will need to install the FileOpen Plug-In on your computer. The FileOpen Plug-In works with Adobe Reader and other viewers. Visit FileOpen to see the full list.

        What you can do with a Secure PDF:
      • Print
      • Search
      • Highlight
      • Bookmark
      Please note that some publishers - including BOMA, IADC and NRC - do not allow printing of their documents.

    • 👥
    • Immediate download
    • $77.00
      Members pay $38.50
    • Add to Cart
    • Printed Edition
    • Ships in 1-2 business days
    • $77.00
      Members pay $38.50
    • Add to Cart
    • Printed Edition + PDF
    • Immediate download
    • $112.00
      Members pay $56.00
    • Add to Cart

Customers Who Bought This Also Bought


About This Item


Full Description


The purpose of this Standard Practice is to provide valve users with information for use in evaluating the manual operation of valves.

It must be understood that this information is general in nature and must be supplemented by specific operational data for the valve and service conditions to be experienced. The maximum and minimum torque ratings of specific valve and actuator types are not covered by this Standard Practice, but must be considered when applying manual input devices to any specific valve. Data from teh valve and actuator manufacturers should be consulted regarding valve and actuator types and ratings.


This Standard Practice provides guidelines for the operation of manually actuated valves as affected by the valve operator's input.

Document History

  1. MSS SP-91-2009


    Guidelines for Manual Operation of Valves

    • Most Recent
  2. MSS SP-91-1992 (R1996)

    Guidelines for Manual Operation of Valves

    • Historical Version