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Types EZH and EZHSO
Figure 9. Type EZH DN 25/50/80 (Spring-to-Close Version) Operational Schematic
Type SA/2
Filter
V
R
Inlet pressure (P
)
INLET PRESSURE (Pu)
u
MOTORIZATION PRESSURE (Pm)
Motorization pressure (P
Pilot feeding pressure (P
PILOT FEEDING PRESSURE (Pup)
Outlet pressure (P
)
OUTLET PRESSURE (Pd)
d
Atmospheric pressure (P
ATMOSPHERIC PRESSURE (Pb)
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
8
M
)
m
)
up
Type PRX:
S - Bleed port
)
B - Supply port
b
Regulator
diaphragm
Type EZH
Type SA/2:
V - Sensing
L - Motorization port
R - Pilot
A - Sensing port
M - Inlet
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
diaphragm (upper chamber). This pressure assists the
main spring that tends to close the regulator, and opposes
the motorization pressure (P
pressure (P
) also opposes the pilot control spring.
d
Upper
diaphragm
Type
PRX/120
S
B
L
A
Lower
diaphragm
) is supplied to the regulator actuator
d
) in the actuator. Outlet
m
Pilot disk
R98
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