Issue
The Drayton Theta YBM2 Valve Body / Actuator assembly is to be replaced.
Environment
- Replacement
- Drayton
- Actuator
- Valve
- YBM2
Cause
The Drayton Theta YBM2 Valve Body / Actuator assembly is obsolete.
Resolution
OVERVIEW
The Drayton Theta YBM2 Valve Body / Actuator assembly is obsolete, and there is no purpose built replacement.
The Valve Body was available in 1.1/4", 1.1/2" and 2" B.S.P. sizes and was normally installed as a mixing valve in variable temperature, constant volume, compensated heating circuits.
No Valve Body / Actuator assemblies are currently available in these sizes.
Details of the YB Valve Body may be viewed here.
VALVE BODY REPLACEMENT
To replace the YBM2 Valve Body the following is required:-
S-E Satchwell MB Valve Body of appropriate size - MB1552 (1.1/4"), MB1602 (1.1/2"), MB1652 (2")
Details of the MB Valve Body may be viewed here.
ACTUATOR REPLACEMENT
The YBM2 Actuator comprised a 3-wire electrical connection enabling it to be operated by a Mains Voltage changeover contact device as follows :-
Terminal M1 – Open signal
Terminal M2 – Close signal
Terminal M3 – Common
The YBM2 Actuator may be replaced by one or other of the following S-E Actuators :-
MD10B-230
MD20B-230 (if MD10B-230 not available)
Details of the MD10B-230 Actuator may be viewed here.
Details of the MD20B-230 Actuator may be viewed here.
LINKAGE KIT
A Linkage Kit will also be required in order to enable the MD Actuator to be mounted on the MB Valve Body.
Linkage Kit LMD/AR-MB (914-1071-000)
Details of the LMD/AR-MB Linkage Kit may be viewed here
In such 3-wire installations the YBM2 Valve / Actuator assembly only will need to be replaced, while any associated Controller and Sensors may be retained.
