NZ/NZ-M and NZOS/NZOS-M Series
10
10
For a wide-open monitor installation (Figures 3 and 4),
adjust the working pilot to a set point higher than the set point of
the monitor pilot. Adjust the monitoring pilot to the desired monitoring takeover pressure. Reduce the pilot to the normal
outlet pressure setting.
For a working monitor installation (Figures 5 and 6),
turn out the adjusting screw of the downstream pilot, removing spring
tension. Adjust the upstream working pilot to the desired intermediate pressure setting. Turn out the adjusting screw of the
upstream monitor pilot, removing tension. Turn in the adjusting screw of the downstream pilot. Adjust the upstream monitor
pilot to the desired set point. Establish final desired downstream pressure by adjusting the downstream pilot.
6. After adjusting the JP Series pilot(s) to the desired pressure setting(s), slowly open the downstream block valve wide open.
7. Close the bypass valve, if used.
WARNING
6.
Shutdown
If the pilot bleed control line (B) pressure is shutdown first, the downstream system may be subjected to full
inlet pressure.
1. First, slowly close the upstream or Inlet Isolation Valve.
2. Close the downstream or Outlet Isolation Valve slowly.
3. Release the pressure inside the regulator and other devices between inlet and outlet isolation valves.
7.
Maintenance
The regulator parts are subject to normal wear and must be inspected periodically and replaced as necessary. The frequency of
inspection and replacement depends on the severity of service conditions and on applicable federal, state and local codes and
regulations.
Use Torque Specifications (Table 4) for proper torque values.
To avoid personal injury or property damage from sudden release of pressure, isolate the regulator from the pressure
system and release all pressure from the pilot and main valve before performing maintenance operations.
Once the maintenance is carried out and regulator is assembled, an external leakage test and lock up test must be
carried out.
Eye nuts are installed to aid in the handling and installation of the Regulator Assembly only. Do not attempt to lift more
weight than the regulator with these eye nuts.
Regular Checks
1. Ensure that there is no leakage on the regulator and tubing connections using soap solution.
2. Observe the outlet pressure gauge to make sure that the desired outlet pressure is stabilized.
Periodic Maintenance
1. A lockup pressure test on Type NZ periodically. A shutoff pressure test on Type NZOS periodically. Under normal
circumstances, it is not necessary to disassemble the regulator from the pipeline.
2. Clean the regulator and pilot periodically. Check the seat, diaphragm, O-rings and other soft parts. Replace any parts that
are worn out or damaged.
3. Check the other parts of the regulator to ensure that they are in good working condition. Change the worn-out parts.
4. Ensure the pipeline system is clean and free of foreign materials.
Main Valve Maintenance
Rubber Seat Maintenance (refer to Figure 7)
1. Remove nuts (key 34).
2. Carefully lift the actuator and bonnet assembly (keys 8,10 and 14) off the body (key 1).
3. Remove ring snap (key 32), O-rings (keys 22 and 33) take out sleeve guide (key 5) and cage (key 4).
4. Take out seat (key 2), inspect rubber parts of seat for damage or wear and replace if necessary. Also, O-ring (keys 22, 25, 27 and
33) and other parts should be inspect and replace if worn out or damaged. Lightly lubricate O-rings before placing them back.
CAUTION
CAUTION
!