AB-7352-U
© 2015–2016 Azbil Corporation All Rights Reserved.
1
Specifications/Instructions
ACTIVAL
Motorized Two-Way Valve with Flanged-End Connection
<4-20 mA DC Input with 4-20 mA DC Feedback Output>
(ANSI Class125 equivalent / Gray cast iron)*
(Spring Return Type Actuator)
General
ACTIVAL
Models VY5198H and VY5198K are series of
motorized two-way valves with flanged-end connection.
Valve and actuator are integrated in a single unit.
Valve size ranges from 1
1
/
2
” to 3”.
Actuator has a reversible synchronous motor, which
operates at a low voltage of 24 V AC. Since the actuator fully
closes the valve in case of power failure, it is suitable for
failsafe application.
4 to 20 mA DC input control signal provides 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.
Valve and actuator integrated in a single unit:
Pre-assembled body requires no adjustment.
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.
4 to 20 mA DC output available for position feedback.
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.
Spring return actuator:
Actuator automatically closes the valve in 0 % position in
case that the power is down.
CE Marking certified:
ACTIVAL Models VY5198H and VY5198K
conform to all
the applicable standards of CE Marking.
* This product was designed and manufactured conforming to the ISO (International Organization for Standardization, PN16/GG-20).
