Emerson Fisher Type 289P Руководство по эксплуатации - Страница 2
Просмотреть онлайн или скачать pdf Руководство по эксплуатации для Измерительные приборы Emerson Fisher Type 289P. Emerson Fisher Type 289P 12 страниц. Pilot-operated relief valve
Также для Emerson Fisher Type 289P: Руководство по установке (4 страниц), Руководство по установке (4 страниц)
Печатать страницу
Type 289P
Specifications
Body Size and End Connection Style
NPS 1 or 2, NPT
Maximum Relief (Inlet) Pressure
nPS 1: 50 psig (3,4 bar) over relief set
pressure or 110 psig (7,6 bar) whichever is lower
nPS 2: 15 psig (1,0 bar)
Relief Set Pressure Ranges
See Table 1
Pilot Information
See Tables 2 and 3
1. Relief pressure plus maximum allowable build-up over setting.
2. The pressure/temperature limits in this manual and any applicable standard or code limitation should not be exceeded.
!
To avoid injury or damage, install,
operate, and maintain the Type 289P in
accordance with federal, state, and local
codes; rules and regulations; and these
instructions. The Type 289P cannot be
used as aSME safety relief valves.
Only a qualified person must install or
service the relief valve. Be certain the
main valve nameplate or pilot spring case
is updated to accurately indicate any field
changes in equipment, materials, service
conditions or pressure settings.
If a leak develops in the system, it
indicates that service is required. Failure
to correct the situation immediately may
create a hazardous condition.
Principle of Operation (Figure 3)
Inlet pressure registers on the underside of the main
valve diaphragm and underside of the pilot diaphragm.
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 registers as loading pressure on top of
the main valve diaphragm, keeping it closed.
When inlet pressure rises above the set pressure, the
pressure on the pilot diaphragm overcomes the pilot
control spring and opens the pilot valve plug. The
pilot exhausts the loading pressure from the top of the
2
(1)(2)
WaRnIng
Pressure Registration
External
Pilot Control Line and Vent Connections
1/4 NPT
Relief Valve Temperature Capabilities
With nitrile (nBR): -20° to 180°F (-29° to 82°C)
With Fluorocarbon (FKM):
0° to 300°F (-18° to 149°C)
approximate Weights
nPS 1: 5 pounds (2 kg)
nPS 2: 15 pounds (7 kg)
main valve diaphragm and plug assembly. While inlet
pressure is above the set pressure, the pilot continuously
exhausts gas. Inlet pressure unbalance overcomes the
main spring force and opens the main valve.
As the inlet pressure drops, the pilot control spring begins
to close the pilot valve plug and the exhaust slows. This
causes the inlet pressure to build in the main valve
diaphragm casing, allowing the control spring to close
the main valve. Once the main valve is closed, the pilot
valve plug closes and the exhaust stops.
Installation
!
Personal injury or system damage may
result if this relief valve is installed
where service conditions could exceed
the limits given on the pilot spring case
or main valve nameplate. Installations
should be adequately protected from
physical damage.
Overpressuring any portion of this
equipment may cause equipment
damage, leaks in the relief valve, or
personal injury due to bursting of
pressure-containing parts. System
operation within the Specifications
section does not eliminate the
possibility of damage from external
sources or debris in the pipeline.
The relief valve should be inspected
for damage regularly and after any
overpressure condition.
(2)
WaRnIng