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
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
• Meets ASME B & PVC, Section I (Liquid Service)
• 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
• Integral 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)
16 |
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