Data Sheet
Bulletin 71.2:92C
7
valve, which positions the main valve to maintain
downstream pressure as specied per ASME Boiler
and Pressure Vessel Code, Section VIII.
In the event that the upstream valve fails, the
downstream regulator will prevent downstream
pressure from rising above safe operating levels.
It is recommended to install some type of warning system,
such as a sentinel relief valve, to warn the operator that a
valve has failed in the system. This will prevent prolonged
operation with one valve, which could cause valve
trim wear and noise associated with operation at high
differential pressures.
When operating in most steam systems, valve setpoints
should be in strict accordance to ASME Boiler and
Pressure Vessel Code, Section VIII. The Type 6492HM
or 6492HTM safety override pilot should be set at
10 psig (0,69 bar) or 10% above maximum downstream
operating pressure of the second valve, whichever
pressure is greater. For example, most HVAC systems
operate at 15 psig (1,0 bar), so the safety override pilot
should be set no higher than 25 psig (1,7 bar).
Figure 5. Diaphragm Differential Pressure for Pressure-Loaded Regulator
26A3808-A
A2508-2
The Type 92C regulator should be installed and used
in accordance with federal, state, and local codes and
regulations. Downstream overpressure protection should
be provided by the user if the maximum inlet pressure
exceeds the downstream pressure of the system. The
pressure and temperature limitations in the Specications
section must be observed.
The Type 92C regulator may be installed in any
orientation. However, on steam service the regulator
should not be installed at the bottom of a tall vertical
pipeline where condensate could collect and create a
pressure head affecting regular performance.
A downstream control line is required for pilot-operated
regulators; the control line is not furnished with the
regulator. An adjustable loading pressure regulator
and loading pressure piping are required for pressure-
loaded regulators.
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