CONTROL PIPE
8B TEE
PILOT
TYPE E MAIN VALVE
ADJUSTING SPRING
PILOT DIAPHRAGM
INTERNAL MAIN SPRING
5A RESTRICTION ELBOW
4A BLEED PORT
Figure 2
. Type E Main Valve Operational Schematic
Principle of Operation
The regulator is operated by initial steam or fluid
pressure. It is normally closed, being held so by
initial pressure on the disc and by an internal main
spring, see Figure 2. When the pilot is opened (see
pilot instructions), initial pressure flows through the
pilot to the 8B tee. 4A bleed port restricts the flow
and pressure builds under the diaphragm and opens
the main valve. The 5A restriction elbow steadies the
operation of the regulator.
Delivery pressure feeds back through the control pipe
to the pilot diaphragm. As this pressure approaches a
balance with the thrust of the adjusting spring, the pilot
throttles the loading pressure. In turn, the main valve
takes a position established by the loading pressure
where just enough steam flows to maintain the set
delivery pressure.
Installation
▲
WARNING
Personal injury or system damage
may result if this regulator is installed,
without appropriate overpressure
protection, where service conditions
could exceed the limits given in
the Specifications section and/or
regulator nameplate.
Additionally, physical damage to the
regulator may result in personal injury
or property damage due to escaping of
accumulated gas. To avoid such injury
and damage, install the regulator in a
safe location.
Under enclosed conditions or indoors,
escaping gas may accumulate and be an
explosion hazard. In this case, the vent
should be piped outdoors.
3
Type E
