8
Description
The Types EZH and EZHSO regulators consist of:
- An "E Body" or an "X Body plus a cap"
- A compensation valve, an interchangeable orice
- An actuator with position indicator
- A pilot system adapted to the required
pressure setpoint
- Same parts and sub-assemblies as in the version
without slam shut
- An "X Body"
- A valve with tight shut-off O-ring
- An automatic slam-shut bypass
- A release relay Type OS2 (see Instruction
Manual D103683X012) consisting of:
· A mechanism box (BM)
· A safety manometric box (BMS) connected to
the outlet side of the regulator
Principle of Operation
Type EZH — Spring-to-Close Version
Type EZH Single-Pilot Regulator
(Figures 9 and 10)
The pilot-operated Type EZH uses inlet pressure
as the operating medium, which is reduced through
pilot operation to load the actuator diaphragm.
Outlet pressure (Pd) opposes the motorization
pressure (Pm) in the actuator and also opposes the
pilot control spring.
When the outlet pressure (Pd) drops below the setting
of the pilot control spring, pilot control spring force on
the pilot diaphragm thus opens the pilot valve plug,
providing additional motorization pressure (Pm) to
the actuator diaphragm. This diaphragm motorization
pressure opens the main valve plug, supplying the
required ow to the downstream system.
Any excess motorization pressure on the actuator
diaphragm escapes downstream through the bleed
restriction in the pilot.
Figure 9. Type EZH DN 25/50/80 (Spring-to-Close Version) Operational Schematic
R98
FILTER
V
R
M
S
L
A
B
TYPE
SA/2
TYPE
PRX/120
TYPE EZH
UPPER
DIAPHRAGM
LOWER
DIAPHRAGM
REGULATOR
DIAPHRAGM
PILOT DISK
S - BLEED PORT TYPE SA/2
B - SUPPLY PORT V - SENSING
L - MOTORIZATION PORT R - PILOT
A - SENSING PORT M - INLET
INLET PRESSURE (Pu)
OUTLET PRESSURE (Pd)
MOTORIZATION PRESSURE (Pm)
PILOT FEEDING PRESSURE (Pup)
ATMOSPHERIC PRESSURE (Pb)
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