Installation - Emerson 63EG Instruction Manual

HOLLOW PASSAGE IN
VALVE PLUG SYSTEM
UPPER PORTION
OF VALVE PLUG
FIXED
RESTRICTION
TO MAIN VALVE
DIAPHRAGM
EXPANDED VIEW OF THE TYPE 6358B RELIEF
PILOT DIAPHRAGM ASSEMBLY AND VALVE PLUG
INLET PRESSURE
OUTLET (EXHAUST) PRESSURE
ATMOSPHERIC PRESSURE
LOADING PRESSURE
Figure 3. Type 6358B Operational Schematic
exhaust faster than it can be replaced through the pilot
restriction. The pilot continuously exhausts gas while
inlet pressure is above the set pressure. This permits
inlet pressure to unbalance the actuator diaphragm
and push the actuator stem against the main valve
plug causing it to open.
As inlet pressure drops back to set pressure, the pilot
control spring closes the pilot valve plug. Loading
pressure again builds up to balance the actuator and
let the main valve plug close.

Installation

WARNING
!
Personal injury, equipment damage or
leakage due to escaping gas or bursting
of pressure-containing parts may result
if the relief valve is installed where its
capabilities can be exceeded or where
conditions exceed any ratings of the
adjacent piping or piping connections.
To avoid injury or damage, install a
Type 63EG or 1098-63EGR relief valve
where: Service conditions are within unit
capabilities (including those given in
the Specifications section) and service
conditions are within applicable codes,
regulations or standards.
Types 63EG and 1098-63EGR
DIAPHRAGM
ASSEMBLY
LOWER PORTION
OF VALVE PLUG
TO EXHAUST PORT
1. Use qualified personnel when installing, operating
2. A Type 63EG or 1098-63EGR may be installed
HOLLOW PASSAGE IN
VALVE PLUG SYSTEM
UPPER PORTION
OF VALVE PLUG
RESTRICTION
PLUG
TO MAIN VALVE
DIAPHRAGM
EXPANDED VIEW OF THE TYPE 6358 BACKPRESSURE PILOT
DIAPHRAGM ASSEMBLY AND VALVE PLUG
INLET PRESSURE
OUTLET (EXHAUST) PRESSURE
ATMOSPHERIC PRESSURE
LOADING PRESSURE
Figure 4. Type 6358 Operational Schematic
Additionally, physical damage to the
relief valve could break the pilot off the
main valve, causing personal injury and
property damage due to escaping gas.
To avoid such injury or damage, install
the unit in a safe location.
Note
On the Type EGR main valve, normal
pressure drop assists shutoff. Therefore,
leakage may result during any reverse
pressure drop condition.
and maintaining regulators. Before installing,
inspect the main valve, pilot and tubing for any
shipment damage or foreign material that may
have collected during crating and shipment. Make
certain the body interior is clean and the pipelines
are free of foreign material. Apply pipe compound
only to the male pipe threads with a NPT body
or use suitable line gaskets and good bolting
practices with a flanged body.
in any orientation, as long as flow through it
matches the direction of the arrow on the main
valve body. An upstream control line is not
required because of the integral pilot supply tubing
(key 28, Figure 12). However, for remote upstream
registration, this tubing may be disconnected from
DIAPHRAGM
ASSEMBLY
LOWER PORTION
OF VALVE PLUG
TO EXHAUST PORT
5