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From Control Valves

Codes and standards are technical documents. Some have legal status. They are useful in procuring control valves in that they can be listed by designation, title, and date in purchase specifications. When they are, vendors must adhere to them without the buyer needing to detail their specific requirements in each specification. Besides being educational and informative, codes and industry standards provide an excellent basis for establishing understanding and communication between the buyer and seller. It will be less expensive to get valves designed and built to the requirements of published documents than to develop new documents that cover the same technical details. Manufacturers are familiar with published codes and standards; if they have to expend time examining unfamiliar technical documents to see if their usual products and services can conform to them, extra charges may be applied and exceptions taken. If the standards that a valve supplier adheres to in his standard construction are sufficient, do not ask for more.

A request to a supplier that a valve meet "all applicable industry standards" is too inexplicit. Any necessary standard should be asked for by designation, title, and date.

This chapter will (1) define codes and standards and give general descriptions...


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© 1998 Instrument Society of America

Products & Services
Hydraulic Valves
Hydraulic valves contain and transfer the flow and pressure of hydraulic fluid in hydraulic power systems. They range from simple shutoff valves to precision control valves.
Valve Actuators
Valve actuators mount on valves and, in response to a signal, move a valve to a desired position using an outside power source.
Manual Valve Actuators
Manual valve actuators do not require an outside power source. They use a handwheel or lever to drive a series of gears whose ratio results in a higher output torque compared to the input (manual) torque.
Pneumatic Valve Actuators
Pneumatic valve actuators adjust valve position by converting air pressure into linear or rotary motion.

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