scope:

This standard describes power-actuating devices for valves 3 in. (75 mm) in diameter and larger and slide gates in ordinary water service.

Actuator types. Actuators described in this standard are divided into the following types:

1. Electric-motor type producing a multiturn rotary motion or used to drive a gearhead drive for a quarter-turn application or electric-motor type with integral drive for quarter-turn applications, as defined in Sec. 4.3.1.2.

2. Cylinder type producing a linear motion.

3. Quarter-turn cylinder type producing a rotary motion.

4. Quarter-turn vane-type actuator producing a rotary motion.

Actuator function. Actuators shall produce a rotary or linear motion to activate a valve or slide gate in open-close, throttling, or modulating service.

Excluded actuators. The following types of actuators are not included in this standard:

1. Motor actuators using water, oil, or gas as the driver medium.

Other exclusions. This standard does not include the following:

1. Electric or electronic controls for electric-motor actuators contained within separate enclosures at a location remote from the actuator or actuator floorstand.

2. Piping, controls, and positioners for cylinder actuators.

3. Intermediate gearhead or mechanism (nonintegral to actuator) between electric power-actuator output and valve/gate stem or shaft.

4. The mechanism connecting a cylinder actuator to a valve or slide gate.

Purpose

The purpose of this standard is to define the minimum requirements for power actuating devices for valves and slide gates, including sizing considerations, design, verification, delivery, handling, and storage.

Application

This standard can be referenced in specifications for power-actuating devices for valves and slide gates. The stipulations of this standard apply when this document has been referenced and then only to power-actuating devices for valves and slide gates.