2
EZH and EZHSO Series
overpressured or is installed where
service conditions could exceed the
limits given in the Specifications
section or where conditions exceed
any ratings of the adjacent piping or
piping connections.
To avoid such injury or damage,
provide pressure-relieving or
pressure-limiting devices (as required
by the appropriate code, regulation
or standard) to prevent service
conditions from exceeding limits.
Additionally, physical damage to the
regulator could result in personal
injury and property damage due to
escaping fluid. To avoid such injury
and damage, install the regulator in a
safe location.
Clean out all pipelines before installation of the
regulator and check to be sure the regulator has
not been damaged or has collected foreign material
during shipping. For NPT bodies, apply pipe
compound to the external pipe threads. For flanged
bodies, use suitable line gaskets and approved
piping and bolting practices. Install the regulator in
any position desired, unless otherwise specified,
but be sure flow through the body is in the direction
indicated by the arrow on the body.
Note
It is important that the regulator be
installed so that the vent hole in the
spring case is unobstructed at all
times. For outdoor installations, the
regulator should be located away
from vehicular traffic and positioned
so that water, ice and other foreign
materials cannot enter the spring
case through the vent. Avoid placing
the regulator beneath eaves or
downspouts and be sure it is above
the probable snow level.
Overpressure Protection
The recommended pressure limitations are
stamped on the regulator nameplate. Some type of
overpressure protection is needed if the actual inlet
pressure exceeds the maximum operating outlet
pressure rating. Overpressure protection should
also be provided if the regulator inlet pressure
is greater than the safe working pressure of the
downstream equipment.
Regulator operation below the maximum pressure
limitations does not preclude the possibility of
damage from external sources or debris in the line.
The regulator should be inspected for damage after
any overpressure condition.
Startup
The regulator is factory set at approximately
the midpoint of the spring range or the pressure
requested, so an initial adjustment may be required
to give the desired results. With proper installation
completed and relief valves properly adjusted,
slowly open the upstream and downstream
shutoff valves.
Adjustment
The adjustment of setpoint is performed using
the pilot adjusting screw. To change the outlet
pressure, loosen the jam nut and turn the adjusting
screw clockwise to increase outlet pressure or
counterclockwise to decrease it. Monitor the outlet
pressure with a test gauge during the adjustment.
Tighten the jam nut to maintain the desired setting.
Taking Out of Service (Shutdown)
!
WARNING
To avoid personal injury resulting from sudden
release of pressure, isolate the regulator from all
pressure before attempting disassembly.
Parts List
EZH and EZHSO Series Main Valve
(Figures 1 and 2)
Key Description
1 Body
2
Seat Ring
3
(1)
Cage
4*
Anti-Friction Ring (2 required)
DN 25, 50 and 80 / NPS 1, 2 and 3 Bodies only
5
Actuator Lower Casing
6
Cap Screws
DN 25 / NPS 1 Body (4 required)
DN 50, 80 and 100 / NPS 2, 3 and 4 Body (8 required)
7* O-ring
8*
Anti-Friction Rings (4 required)
9*
O-ring (2 required)
10
Pipe Plug
11
Actuator Upper Casing
13 Spring
EZH Series
DN 25, 50 and 80 / NPS 1, 2 and 3 Body
DN 100 / NPS 4 Body
(2)
EZHSO Series
(2)
14 Sleeve
EZH Series
DN 25, 50 and 80 / NPS 1, 2 and 3 Body
DN 100 / NPS 4 Body
(2)
EZHSO Series
(2)
15* O-ring
16
Socket Head Cap Screw
DN 25 and 50 / NPS 1 and 2 Body (6 required)
DN 80 / NPS 3 Body (12 required)
DN 100 / NPS 4 Body (8 required)
17* O-ring
18
Inlet Plate
19
Outlet Plate
20* Diaphragm
21
Cap Screw
DN 25, 50 and 80 / NPS 1, 2 and 3 Body
(14 required for EZH Series, 16 required for EZHSO Series)
DN 100 / NPS 4 Body (16 required)
22
Plain Washer (16 required)
23
Hex Nut (16 required)
*Recommended spare part
1. When retrofitting an EZH Series with pins with the new cage, it is also necessary to order the Seat Ring.
2. Parts are not orderable. See sleeve subassembly in Instruction Manual if it needs to be replaced.
