Installation
Waukesha Cherry-Burrell Brand W71/W72RS Sch. 5 Mix Proof Valves
Page 12
95-03091
08/2018
Installation
Installation of a steam flush system on a W70 Series Mix Proof
valve should be done only by a licensed Steam Fitter.
The valve must be installed vertically to drain out any steam/
condensate and have a drain funnel placed directly below it.
Refer to Figure 9 to see the shut-off valves in the supply lines.
Function
The low pressure steam enters through port B of the upper stem
steam flush adapter. Steam purges the outside and inside of the
upper stem and the vent cavity. Steam exits out the leakage port
F.
For steam flushing the outside of the lower stem (balancer), the
low pressure steam enters port D and exits at port E.
Table 1: Callout table for Figure 9
A. Saturated Steam (wet steam)
Max 10 psig
B. Steam IN (Upper Stem Adapter)
C. Product
D. Steam IN (Lower Stem Adapter)
E. Steam out of Lower Stem Adapter
F. Steam out from vent cavity (leakage
port)
Figure 9 - Steam Flush Option for Stem and Vent Cavity
Schematic
B
D
C
C
F
VA100-314
E
A
WARNING
The W70 Series Mix Proof Valve
equipped with the steam flush option for
stem and vent cavity is designed
only
for
low-pressure, product-compatible
saturated steam
with a maximum pres-
sure of 10 psig (0.65 bar) = 240
°
F
(115
°
C) temperature.
DANGER
The steam connection must be shut off
and the valve must cool before servicing
the valve.