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CONVERTING FROM RV STYLE RELIEF VALVE TO DOUBLE SETTING RV STYLE RELIEF VALVE
1. On standard RV style relief valve, loosen lock and seal nut (27).
2. Turn adjusting screw (26) counterclockwise to decrease pressure on spring (29).
3. Remove relief valve cap (24) and gasket (25) along with lock and seal nut (27) and adjusting screw (26).
4. Install double setting relief valve mechanism in accordance with instructions in ASSEMBLY OF DOUBLE
SETTING RV STYLE RELIEF VALVE.
JACKETED PUMPS
Jacketed faceplates and backplate are available on 3500, 4500, 3600, 3700, 4600, 4700 series pumps. They look
similar to the standard nonjacketed ones described in this manual except for the four threaded taps on the
jacketed faceplates and backplates. Two of the four taps are piped as inlet and outlet for the heating or cooling
medium. It is recommended that steam, when used, be piped into the jacket from a top tap and out through a
bottom tap. Liquid, when used, should be piped into the jacket from a bottom tap and out a top tap. In addition to
the two taps on both endplates not used for piping, two ¼” NPT taps on the jacketed backplate are provided to
facilitate clean out of scale.
The heating or cooling medium should be steam or a noncorrosive, nonclogging liquid. A steam medium is limited
to 350 F [177 C] maximum. A liquid medium is limited to 450 F [232 C] maximum. The jacketing is limited to
125 psi [862 kPa] maximum.
WARNING! Other special parts will be required to operate at temperatures up to 450 F [232 C].
The jacketed RV style relief valve faceplate, similar to non-jacketed, must have the adjusting screw offset toward
the discharge side of the pump.
JACKETED RV STYLE RELIEF VALVE FACEPLATE
Figure 5.10
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