DeZurik POWERRAC R3 Installations- und Betriebshandbuch - Seite 4

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DeZURIK

R3 PowerRac

Cylinder Actuator

Description

The R3 PowerRac Cylinder Actuator is a quarter-turn double-acting enclosed rack and gear cylinder

actuator. The actuator is used for on-off or modulating control of butterfly valves and other valves that

have a square or double-D shaft connection. A choice of an 8" (200 mm) or a 10" (250 mm) diameter

cylinder is offered. A lockable model is available as an option.

Installation

The actuator requires two pneumatic connections— one to each port on opposite ends of the cylinder.

Air to the connection closest to the actuator drives the actuator clockwise, towards the "shut" position

on the dial; air to the connection farthest from the actuator drives the actuator counterclockwise,

towards the "open" position on the dial. The 8" (200 mm) cylinder has ½" NPT connections, and the 10"

(250 mm) cylinder has ¾" NPT connections.

Operation

The R3 PowerRac Cylinder Actuator is powered pneumatically, and rotates 90° between the open and

closed positions. The cylinder is sized for 60 psi or 80 psi (415 kPa or 550 kPa), and is limited to 100

psi (690 kPa) maximum.

Lubrication

The R3 PowerRac Cylinder Actuator is lubricated at the factory, and does not require routine

maintenance lubrication. If the actuator is disassembled, lubrication is required as described in the

Actuator Reassembly section.

Open and Closed Position Stops

The adjustable open and closed position stops prevent the actuator from rotating beyond the open and

closed positions of the valve. If the actuator is factory-mounted on the valve, the stops are preset, and

do not require further adjustment. If the actuator is not factory-mounted on the valve, or if the actuator is

removed and/or disassembled, the stops will require adjustment as described below. Refer to the Valve

Instructions for closed-position information, and adjust the stop screws after the actuator is mounted on

the valve.

The adjustable stop screws are secured with jam nuts, and are located in the extreme ends of the

actuator as shown in Figures 1 and 2. The closed position stop is located in the cylinder cap, and the

open position stop is located in the end cover. To adjust either stop screw, loosen the jam nut and turn

the screw counterclockwise to increase the stroke, or clockwise to decrease the stroke. After the stop is

adjusted to the desired position, hold the screw from turning, and tighten the jam nut.

D10359

Page 4

August 2016