BS 4151:1967

This standard BS 4151:1967 Method of evaluating pneumatic valve positioners with input signal of 3 to 15 lbf/in² (gauge) is classified in these ICS categories:

• 23.100.50 Control components

This standard specifies tests designed to determine the performance of pneumatic valve positioners which accept input signals of 3 lbf/in² to 15 lbf/in².

NOTE Throughout this British Standard the term “valve operator” is used; alternative and equally appropriate terms used within industry are “valve motor” and “valve actuator”.

Although some valve positioners may be tested without being fitted to a valve operator, there are some positioners which form an integral part of the operator and these cannot be separately tested. The method of evaluation described in this standard therefore specifies the use of a valve operator in all cases since this allows a ready comparison to be made between different types.

The operator may be a spring-opposed or double-acting diaphragm or piston.

Specifies tests to determine performance of pneumatic valve positioners with 3 to 15 lbf/in² (gauge) input signal. Method of evaluation specifies use of a valve operator of a spring-opposed or double-acting diaphragm or piston type in order to allow a ready comparison to be made between different types of positioner.