8
V
R
M
S
L
A
B
R98
INLET PRESSURE (Pu)
OUTLET PRESSURE (Pd)
MOTORIZATION PRESSURE (Pm)
PILOT FEEDING PRESSURE (Pup)
ATMOSPHERIC PRESSURE (Pb)
Types EZH and EZHSO
Europe, Middle East and
Africa Only
DESCRIPTION
The Types EZH and EZHSO regulators consist of:
• Version without Integral Slam-Shut Valve:
- An "E Body" or an "X Body plus a cap"
- A compensation valve, an interchangeable orifice
- An actuator with position indicator
- A pilot system adapted to the required pressure setpoint
• Version with Integral Slam-Shut Valve:
- 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 (lower chamber).
Outlet pressure (P
d
) is supplied to the regulator actuator
diaphragm (upper chamber). This pressure assists the
main spring that tends to close the regulator, and opposes
the motorization pressure (P
m
) in the actuator. Outlet
pressure (P
d
) also opposes the pilot control spring.
Figure 9. Type EZH DN 25/50/80 (Spring-to-Close Version) Operational Schematic
Filter
Type SA/2
Type
PRX/120
Type EZH
Inlet pressure (P
u
)
Motorization pressure (P
m
)
Pilot feeding pressure (P
up
)
Outlet pressure (P
d
)
Atmospheric pressure (P
b
)
Upper
diaphragm
Lower
diaphragm
Regulator
diaphragm
Pilot disk
Type PRX:
S - Bleed port
B - Supply port
Type SA/2:
V - Sensing
R - Pilot
M - Inlet
L - Motorization port
A - Sensing port
