DeZurik POWERRAC R1 Instruction Manual - Page 5

Browse online or download pdf Instruction Manual for Controller DeZurik POWERRAC R1. DeZurik POWERRAC R1 20 pages. Spring-return actuator used on 1/2-3" pec eccentric valves

Print Page
DeZurik POWERRAC R1 Instruction Manual
DeZURIK

Installation

All cylinder port connections are 1/4" NPT. The spring-return actuator requires one pneumatic
connection as shown below.

Spring-to-Close

With a spring-to-close spring actuator, air to the connection drives the actuator counterclockwise,
towards the "open" position on the dial.
Figure 2—Spring-to-Close

Spring-to-Open

With a spring-to-open actuator, air to the connection drives the actuator clockwise, towards the "shut"
position on the dial.
Figure 3—Spring-to-Open
As the spring-return actuator is cycled, air is alternately exhausted and drawn in through a breather.
The breather is located at one end of the cylinder as shown in Figures 2 and 3. The breather must be
protected from water because water inside of the actuator will cause sticking and premature wear of the
internal components.
If the actuator is located outdoors or in an area that will be hosed down, the breather must be oriented
vertically. The "umbrella" top of the breather will then prevent water from being drawn in through the
breather. In locations that are submerged or subject to flooding, the breather must be removed and
remotely piped to a protected location.
November 2020
Page 5
D10389