Honeywell V4073 mid position valve - 8 o'clock gun

Joined
7 Jan 2012
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Location
Sussex
Country
United Kingdom
I've got a Honeywell V4073 mid position valve which is working fine, with one exception. If it's in the central position (CH & HW) and the HW reaches temperature, the actuator drives the valve to the CH only position but there's a loud bang from the valve as it reaches position - it sounds like a canon going off and really rattles the pipes!

A bit of testing reveals that this only happens in the CH & HW to CH direction.

With the actuator removed the valve stem moves easily (i.e. with fingers) and smoothly, and there doesn't seem to be anything catching in the valve itself.

Any ideas on possible cause?

I've noticed that the pump runs for most of the time while the valve is moving position, except for a very brief pause at the start. Is this normal, or should the pump shut off until the valve's in position?

I also wondered if excess play in the valve or actuator could be responsible - i.e. the valve slamming shut when the water pressure takes up the play and forces the valve into the HW closed position?

I'd really appreciate any thoughts before going to the time and expense of replacing the valve and/or actuator.

Joe
 
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