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Installation, Operation and Maintenance Manual
VA-DC-000-1952 Rev. 0
1.2.6
The reservoir tank is provided with a stainless steel sight glass level viewer.
1.2.7
The following is a functional description of the ECAT System for valve actuators and a brief
explanation of the main components that make this ECAT system unique. Throughout this
explanation numbers which appear in parenthesis ( ) correspond to item numbers on Schematic
Diagram 11547-S.
The ECAT system provides energy for operation of valve actuators during normal operation as well as
emergency shutdown. This energy is hydraulic power stored in the Accumulator (76). When required,
the Accumulator (76) pushes the hydraulic fluid into the power oil header line. The power oil header
line supplies the actuator power for operation.
The hydraulic fluid leaving the valve actuator will pass through the return oil header line back into the
Oil Reservoir (60) creating a closed loop system.
The Accumulator (76) gets its power from high-pressure pipeline gas pushing on the accumulator's piston.
The hydraulic fluid, stored in the Accumulator (76), originates from the Oil Reservoir (60). Fluid
is drawn from the Oil Reservoir (60) and through the suction line by a Hydraulic Pump (67). The
hydraulic pump (67) forces the fluid through the discharge line and into the Accumulator (76).
The ECAT system has one electric motor driven Hydraulic Pump (67). The pump is controlled by a
motor control switch operated by the Thermal-Volume Controller (77). While in operation, if the
Thermal-Volume Controller (77) moves a small amount actuating the Motor Start / Stop Switch (78)
to the "On" position, the electric motor driven Hydraulic Pump (67) will start to run. The pump will
operate until the Thermal-Volume Controller moves and actuates the Motor Start / Stop Switch (78)
to the "Off" position.
1.2.8
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Introduction
Fluid Level in Reservoir
Functional Description
Product Attributes
Easy installation – ECAT actuator is a totally self-contained system and designed for
compactness and adaptable to new or existing valves
Designed for Bettis™ or Shafer hydraulic double-acting actuator and controls, including
the handpump
Shafer™ hydraulic control technology
Multiple input power options with either AC or DC
Local open / close control
Fast speed of operation to fail-safe position if required
Accumulator suitable for hydraulic and natural gas service
Operating pressures up to 2220 psi with standard components
Section 1: Introduction
April 2021
2
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