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Type 63EGLP/63EGLP-16
Specifications
Specifications for the Type 63EGLP/63EGLP-16 construction is listed on Specifications section and Tables 1 to 3.
The specifications for a given construction as it originally comes from the factory are stamped on nameplates
located on the main valve body. The pilot valve set pressure appears on the pilot spring case.
Available Constructions
Type 63EGLP/63EGLP-16 with two
Type 6358EBLP Pilots
Type 63EGLP/63EGLP-16 with two
Type 6358EBHLP Pilots
Main Valve Body Size
(1)
Type 63EGLP: NPS 4 / DN 100
Type 63EGLP-16: 2 MNPT
End Connection Style
Type 63EGLP: CL300 RF, NPT
Type 63EGLP-16: MNPT
Maximum Relief Inlet Pressure
Type 63EGLP: 400 psig / 27.6 bar
Relief Set Pressure Ranges
See Table 1a and 1b
Main Valve Port Diameter:
NPS 4 / DN 100, CL300 RF: 4.38 in. / 111 mm
2 MNPT: 2.38 in. / 60 mm
1. 4x3 in. flange reducer assembly available for 3 in. flange connections. See Parts List.
2. The pressure and/or temperature limits listed in this Instruction Manual and any applicable standard limitation should not be exceeded.
3. Includes buildup.
4. Set pressure is defined as the pressure at which the pilot (on UL
5. Product has passed Fisher™ performance testing for Start-to-Discharge and reseal at -40ºF / -40ºC.
Pilot Valve
The pilot valve regulator is responsible for the relief valve
assembly's setpoint start-to-discharge pressure. The
Type 63EGLP/63EGLP-16 relief valve uses a unique
dual-pilot valve assembly that allows maintenance to
one pilot while the alternate pilot continues to supply
pressure to the main valve assembly, providing
overpressure protection at all times when used correctly.
The Type 63EGLP/63EGLP-16 Relief Valve utilizes
one of two pilots: Type 6358EBLP or 6358EBHLP. Any
Type 63EGLP shipped with certifications will use a
specific version of the Type 6358EBLP pilot with required
setpoint secured in place.
Principle of Operation
A pressure relief valve is a throttling pressure control
device that opens and closes to ensure the upstream
pressure does not rise above a predetermined pressure.
UL
is a mark owned by Underwriters Laboratories.
®
2
(2)(3)
(2)
product) or the main valve (on ASME product) starts-to-discharge.
®
Valve Plug Travel:
NPS 4 / DN 100, CL300 RF: 2.00 in. / 51 mm
2 MNPT: 1.13 in / 29 mm
Main Valve Flow Characteristic
Linear
Main Valve Flow Direction
Up through seat ring and out through cage
Main Valve Material
WCB Steel
Maximum Temperature Capabilities
Nitrile (NBR): -20 to 180°F / -29 to 82°C
Approximate Weights (including pilots)
NPS 4 / DN 100, CL300 RF: 178 lbs / 81 kg
2 MNPT: 55 lbs / 25 kg
Refer to Figure 3. Type 63EGLP/63EGLP-16 Pressure
Relief Valve with dual-pilot assembly has an active pilot
and a standby pilot. Only the active pilot senses the
changes in the inlet pressure. The handle assembly is
always pointing away from the active pilot.
As long as the inlet pressure is below the set pressure,
the pilot control spring keeps the pilot valve plug closed.
Inlet pressure passes through the pilot restriction and
through the hollow passage of the valve plug then
registers as loading pressure on top of the main valve
plug. Force from the main spring, in addition to pilot
loading pressure, provides downward loading pressure to
keep the main valve plug tightly closed.
When the inlet pressure rises above the set pressure, the
pressure on the pilot diaphragm overcomes the control
spring and opens the valve plug. The pilot then exhausts
the loading pressure from the top of the main valve plug.
The pilot continuously exhausts gas while inlet pressure
is above the set pressure. The inlet pressure unbalance
overcomes the main spring force and opens the plug.
(2)(5)
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