VIII. Introduction
A. General Introduction
A pilot operated pressure relief valve is a pressure relief
valve in which the major relieving device is combined
with and is controlled by a self actuated auxiliary
pressure relief valve.
1
Note 1: Source ASME Code, Section VIII-Div.1,
Paragraph UG-126.
The Consolidated Modular Pilot Valve (MPV) is designed
to provide reliable performance characteristics and
stable operation within a pressure range of 15 to 6250
psig (10.34 to 430.92 barg)
B. Main Valve Introduction
The Consolidated Pilot Operated Safety Relief Valve
(POSRV) cast bodies are designed to meet the often
specified inlet and outlet connection combinations. Sizes
range from 1” - 12” (25.4 mm - 304.80 mm); pressure
ratings from 150 - 2500 class. The standard metal seat is
the same design that has been successfully utilized in the
Consolidated SRV for over 50 years.
Capacities are certified by National Board of Boiler
and Pressure Vessel Inspectors and published in their
NB18 entitled “Pressure Relief Device Certifications”.
Main Valve Features
• Orifice controlled capacity
• Superior tightness
• Removable nozzles for replacement or remachining
• Standard O-Ring sizes: readily available, easily
replaced
• Meets ASME Section VIII, Div. 1
• National Board certified capacities
• Uses many parts standard on 1900 Series SRV
Service and Applications
Main valve pressure and temperature limitations are
combined in pressure class categories according to ANSI
Standards. Conversely, the pressure and temperature
limits of the Pilot Valve are presented separately.
Note: When replacing or repairing the main valve
and pilot valve assembly, pay particular attention to
the pressures and temperature limitations for both the
main valve and pilot valve to ensure compatibility.
C. Pilot Valve Introduction
Standard pilot construction consists of 316SS
parts with Nitrile O-Rings with Teflon
®
based seals
throughout. Standard Steam and High Temperature
Pilot Construction consists of 316SS parts with Teflon
®
O-Rings and seals. Alternate materials can be provided
by contacting the factory.
Pilot Valve Features
• One pilot fits all main valves
• Standard O-Ring seals
• Superior seat tightness
• Accurate adjustment of blowdown and set point
• Positive closure after blowdown
• Reduces icing and clogging
• Field test connection
• Remote Sensing
• External blowdown adjustments
Table 1: Service and Applications
Model
Service
Pressure Range
Temperature Range
min.
max.
min.
max.
psig
barg
psig
barg
°F
°C
°F
°C
39PV07, GS, SS, or LA
Gas, Air, Steam or Liquid
15
1.03
750
51.71
-40
-40.0
505
262.8
39MV07 GS or SS
Gas, Air or Steam
15
1.03
750
51.71
-40
-40.0
505
262.8
39MV07 LS
Liquid
15
1.03
750
51.71
-40
-40.0
505
262.8
39PV37 GS, SS, or LA
Gas, Air, Steam or Liquid
751
51.78 3750 258.55 -40
-40.0
505
262.8
39MV22 GS or SS
Gas, Air or Steam
751
51.78 3750 258.55 -40
-40.0
505
262.8
39MV22 LA
Liquid
751
51.78 3750 258.55 -40
-40.0
505
262.8
39MV72 GS, SS or LA
Gas, Air, Steam or Liquid 3751 258.62
6250
430.92 -40
-40.0
505
262.8
Note: With the installation of the heat exchanger, temperature range may be expanded to -450°F to 1200°F.
( -267.8°C to 648.9°C)
Consolidated 2900 Series POSRV Maintenance Manual
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© 2018 Baker Hughes, a GE company. All Rights Reserved.
