Specifications/Instructions
1
AB-7489-U
ACTIVAL
TM
Motorized Two-Way Valve with Flanged-End Connection
(ANSI Class 125 / A126 Class B)
Overview
ACTIVAL
TM
Model VY51_ _J is a series of motorized two-
way valves with flanged-end connection. Rotary valve and
actuator are integrated in a single unit.
The valve body rating corresponds to ANSI Class 125.
Actuator has a reversible synchronous motor, which operates
at a low voltage of 24 V AC.
Two kinds of control signals are available to operate the
ACTIVAL.
1. 4–20 mA DC input
2. 2–10 V DC input
Both provide proportional control in combination with a
single loop controller (e.g., Model SDC35/SDC36).
Features
•
Compact and lightweight:
Rotary motor actualizes small body and light weight.
•
NEMA 4X Enclosure
•
Valve and actuator integrated in a single unit:
Pre-assembled body requires no adjustment.
•
A variety of control signals available:
- 4–20 mA DC input
- 2–10 V DC input
•
Valve for chilled/hot water control and for steam control
applicable to high differential pressure, large Cv value,
high rangeability, and low leakage.
•
Durable actuator with low power consumption.
•
Equal percentage flow characteristics.
•
2–10 V DC output (for position feedback) available with
2–10 V DC input type.
•
4–20 mA DC output (for position feedback) available with
4–20 mA DC input type.
For 4–20 mA Model
•
Open/close changeover for input signal failure:
Actuator fully opens/closes valve in case that the control
signal is not input to the actuator. (Default: Fully open)
•
Direction changeover of control action:
Open/close action by 4 to 20 mA DC input signal is
reversely controllable.
Normal action 4 mA: 0 % to 20 mA: 100 %
Reverse action 20 mA: 0 % to 4 mA: 100 %.
(Default: Normal action)
•
Adjustable dead band*:
Dead band width can be narrowed to more precisely
operate valve actuator.
*
Actuator is not operated by input signal changed less than a
certain amount. This amount of change is called dead band.
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