Issue
Satchwell MB series 3-port Rotary Shoe Valve Body conversion for use as a 2-port Zone Valve.
Environment
HVAC heating and cooling installations requiring a 2-port Zone Valve having pipework connection size in excess of 3/4" B.S.P.
Cause
HVAC heating or cooling installations requiring a 2-port Zone Valve Body having a connection sizes in excess of the usual 3/4" B.S.P.
HVAC heating or cooling installations requiring a 2-port Valve Body to be installed in place of a 3-port Valve Body originally installed.
Resolution
1 Install plumber's plug in Port 3 of MB series 3-port Rotary Shoe Valve Body.
2. Tighten plumber's plug sufficiently to ensure PN 10 rating of Valve Body is not compromised.
IMPORTANT
Careful consideration should be given to the use of this conversion method with 3-port Valve Bodies of Plug and Seat construction.
Here only "dish nosed" or "hollow ended" plumber's plugs should be installed in Port 3 of the Valve Body.
The purpose of this is to prevent fouling of the Plug / Seat assembly within the Valve Body.
N.B.
In preference a Satchwell VZ 2-port Plug and Seat Valve Body should be replaced by a Satchwell MZ 3-port Plug and Seat Valve Body.
