Emerson EZL Instruction Manual

Instruction Manual Form 5781
January 2015
Type EZL
Type EZL Pressure Reducing Regulator for Low Pressure Applications
W8962
Figure 1. Type EZL Pressure Reducing Regulator
Scope of Manual
This manual provides installation, startup, maintenance and parts ordering information for the Type EZL pressure reducing regulator. Information on other equipment used with this regulator is found in separate manuals.
Product Description
Type EZL regulators are accurate pilot-operated, pressure balanced and soft seated regulators. They are designed for use in natural gas distribution applications such as district regulating stations and commercial/industrial meter sets. They provide low differential, smooth, reliable operation, tight shutoff and long life.
D103091X012
www.fisherregulators.com
Type EZL

The Specications section lists the specications for Type EZL pressure reducing regulator. Factory specications for specic regulator constructions are stamped on the nameplate fastened to either the main actuator or the pilot
spring case.

Type EZL: Pilot-operated pressure reducing regulator for low to high outlet pressure
Body Sizes, End Connection Styles and Pressure Ratings
(1)
See Table 1
Maximum Pressures
(1)
Inlet and Outlet (Design): 285 psig / 19.7 bar Emergency (Design Casing): 285 psig / 19.7 bar Operating Differential: 285 psid / 19.7 bar d
Outlet Pressure Ranges
See Table 2
Minimum Differential Pressure
TRIM, PERCENT
OF CAPACITY
100
80 50 30
MINIMUM DIFFERENTIAL FOR
2 in. /
DN 50
2.9 / 0.204
2.9 / 0.204
3.0 / 0.207
3.4 / 0.234
Temperature Capabilities
Standard Elastomers:
-20 to 180°F / -29 to 82°C
High-Temperature Elastomers:
0 to 180°F / -18 to 82°C
(1)
FULL STROKE, psid / bar d
(1)
Options
• Prepiped Pilot Supply
• Travel Indicator
• Integral Type OS2 Slam-shut Device
1. The pressure/temperature limits in this Instruction Manual and any applicable standard or code limitation should not be exceeded.
Table 1. Main Valve Body Sizes, End Connection Styles and Body Ratings
MAIN VALVE BODY SIZE MAIN VALVE BODY MATERIAL END CONNECTION STYLES STRUCTURAL DESIGN RATING
2, 3 and 4 in. /
DN 50, 80 and 100
1. Structural Design Rating is the rating for the main valve body. The Type EZL complete assembly is limited to 285 psig / 19.7 bar.
2. Available only on 2 in. / DN 50 body
WCC Steel
Cast Iron
(2)
(2)
or SWE
NPT
CL150 RF 290 psig / 20.0 bar CL300 RF 750 psig / 51.7 bar
CL600 RF or BWE 1500 psig / 103 bar
(2)
NPT CL125B FF 200 psig / 13.8 bar CL250B RF 500 psig / 34.5 bar
1500 psig / 103 bar
400 psig / 27.6 bar
3 and 4 in. /
DN 80 and 100
2.9 / 0.204
3.1 / 0214
3.2 / 0.221
3.5 / 0.241
(1)
PILOT TYPE
6352 2 to 10 0.14 to 0.69 Black 14A9673X012
6353
(1)
6354L
(2)
6354M
6354H
61L
61HP
161M
161EBM
1. Without diaphragm limiter.
2. With diaphragm limiter.
2
Table 2. Outlet Pressure Ranges
OUTLET CONTROL PRESSURE RANGE psig bar
3 to 40
35 to 125
85 to 200 175 to 220 200 to 285
0.25 to 2 1 to 5
2 to 10 5 to 15
10 to 20 15 to 45
35 to 100
100 to 285
5 to 15
10 to 125
120 to 300
5 to 15 10 to 40 30 to 75
70 to 140 130 to 200 200 to 350
0.21 to 2.8
2.4 to 8.6
5.9 to 13.8
12.1 to 15.2
13.8 to 19.7
0.02 to 0.14
0.07 to 0.34
0.14 to 0.69
0.34 to 1.0
0.69 to 1.4
1.0 to 3.1
2.4 to 6.9
6.9 to 19.7
0.34 to 1.0
0.69 to 8.6
8.3 to 20.7
0.34 to 1.0
0.69 to 2.8
2.1 to 5.2
4.8 to 9.6
9.0 to 13.8
13.8 to 24.1
SPRING COLOR SPRING PART NUMBER
Yellow
Red Blue
Blue
Green
Red
Yellow
Blue Brown Green
Yellow
Blue
Red Yellow
Red Green
White
Yellow
Black
Green
Blue
Red
1E392527022 1K748527202
1L346127412 1L346127412 15A9258X012
1B886327022 1J857827022 1B886427022 1J857927142 1B886527022
1E392527022 1D387227022 1D465127142
1E392527022 1K748527202 15A9258X012
17B1260X012 17B1262X012 17B1259X012 17B1261X012 17B1263X012 17B1264X012
E0944
Type EZL
“C” PORT LOADING PRESSURE
Type EZL
“A” PORT INLET PRESSURE
E0944
INLET PRESSURE
OUTLET PRESSURE
LOADING PRESSURE
ATMOSPHERIC PRESSURE
“D” PORT SENSE PRESSURE
P590 SERIES PILOT SUPPLY FILTER
TYPE 6352 PILOT
TYPE EZL MAIN VALVE
Figure 2. Type EZL with Type 6352 Pilot and Type P590 Pilot Supply Filter Operational Schematic
Principle of Operation
Single-Pilot Regulator
The pilot-operated Type EZL (Figure 2 or 3) uses inlet pressure as the operating medium, which is reduced through pilot operation to load the actuator diaphragm.
Outlet or downstream pressure opposes loading
pressure in the actuator and also opposes the pilot control spring.
When outlet pressure 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 loading pressure to the actuator diaphragm. This diaphragm loading pressure opens
the main valve plug, supplying the required ow to the
downstream system. Any excess loading pressure on
the actuator diaphragm escapes downstream through the bleed restriction in the pilot.
When the gas demand in the downstream system
has been satised, the outlet pressure increases.
The increased pressure is transmitted through the downstream control line and acts on the pilot diaphragm. This pressure exceeds the pilot spring
setting and moves the diaphragm, closing the orice.
The loading pressure acting on the main diaphragm bleeds to the downstream system through a bleed restriction in the pilot.
Adjustment
The adjustment of the regulator is performed by means of the pilot adjusting screw, which varies the compression of the control spring. Adjustment
3
Type EZL
E0959
Type EZL
INLET PRESSURE
P590 SERIES PILOT SUPPLY FILTER
TYPE 61L PILOT
E0959
INLET PRESSURE
OUTLET PRESSURE
LOADING PRESSURE
ATMOSPHERIC PRESSURE
SENSE PRESSURE
LOADING PRESSURE
TYPE EZL MAIN VALVE
Figure 3. Type EZL with Type 61L Pilot and Type P590 Pilot Supply Filter Operational Schematic
is performed while the regulator is in operation with the aid of a pressure gauge to monitor downstream pressure. The shutoff valve downstream of the regulator must not be completely closed; it is necessary that a small quantity of gas ows downstream to allow the outlet side to vent, when it is necessary to lower the pressure.
Monitoring Systems
Monitoring regulation is overpressure protection by containment, therefore, there is no relief valve to vent to the atmosphere. When the working regulator fails to control the pressure, a monitor regulator installed in series, which has been sensing the downstream and control pressure, goes into operation to maintain the downstream pressure at a slightly higher than normal pressure. During an overpressure situation, monitoring keeps the customer on line. Also, testing is relatively easy and safe. To perform a periodic test on a monitoring regulator, increase the outlet set pressure of the working regulator and watch the outlet pressure to determine if the monitoring regulator takes over at the appropriate outlet pressure.
Wide-Open Monitoring Systems (Figure 4)
There are two types of wide-open monitoring systems: upstream and downstream. The difference between upstream and downstream monitoring is that the functions of the regulators are reversed. Systems can be changed from upstream to downstream monitoring and vice-versa, by simply reversing the setpoints of the two regulators. The decision to use either an upstream or downstream monitoring system is largely a matter of personal preference or company policy.
In normal operation of a wide-open conguration, the
working regulator controls the system’s outlet pressure. With a higher outlet pressure setting, the monitor regulator senses a pressure lower than its setpoint and tries to increase outlet pressure by going wide-open. If the working regulator fails, the monitoring regulator assumes control and holds the outlet pressure at its outlet pressure setting.
4
E0948
Type EZL
P590 SERIES PILOT SUPPLY FILTER
TYPE 67C PILOT SUPPLY REGULATOR
Type EZL
TYPE 6352 PILOT
E0948
INLET PRESSURE
OUTLET PRESSURE
LOADING PRESSURE
INTERMEDIATE PRESSURE
ATMOSPHERIC PRESSURE
TYPE 6352 PILOT
TYPE EZL MAIN VALVE TYPE EZL MAIN VALVE
Figure 4. Wide-Open Monitoring System Operational Schematic
P590 SERIES PILOT SUPPLY FILTER
Working Monitoring Regulators (Figure 5)
In a working monitoring system, the upstream regulator requires two pilots and it is always the monitoring regulator. The additional pilot permits the monitoring regulator to act as a series regulator to control an intermediate pressure during normal operation. In this way, both units are always operating and can be easily checked for proper operation.
In normal operation, the working regulator controls the outlet pressure of the system. The monitoring regulator’s working pilot controls the intermediate pressure and the monitoring pilot senses the system’s outlet pressure. If the working regulator fails, the monitoring pilot will sense the increase in outlet pressure and take control.
Note
The working regulator must be rated for the maximum allowable operating pressure of the system because this will
be its inlet pressure if the monitoring regulator fails. Also, the outlet pressure rating of the monitoring pilot and any other components that are exposed to the intermediate pressure must be rated for full inlet pressure.
Working monitor installations require a Type EZL main valve with a working pilot and a monitoring pilot for the upstream regulator and a Type EZL with the appropriate pilot for the downstream regulator.
Adjustment
Adjusting the monitor regulator is similar to adjusting the main regulator. Monitor setpoints are set slightly higher than the main regulator. However, the value of this difference cannot be determined in advance, as it depends on the particular characteristics of each application.
5
Type EZL
E0946
Type EZL
P590 SERIES PILOT SUPPLY FILTER
E0946
INLET PRESSURE
OUTLET PRESSURE
LOADING PRESSURE
INTERMEDIATE PRESSURE
ATMOSPHERIC PRESSURE
TYPE 161EBM MONITOR PILOT
TYPE 6352 PILOT
P590 SERIES PILOT SUPPLY FILTER
TYPE EZL MAIN VALVE TYPE EZL MAIN VALVE
TYPE 6352 PILOT
Figure 5. Working Monitoring System Operational Schematic
Installation
WARNING
!
Personal injury or equipment damage, due to bursting of pressure-containing parts may result if this regulator is overpressured or is installed where service conditions could exceed the limits

on the appropriate nameplate or where conditions exceed any rating of the adjacent piping or piping connections. To avoid such injury or damage, provide pressure-relieving or pressure-limiting devices to prevent service conditions from exceeding those limits. Also, be sure the installation is in compliance with all applicable codes and regulations.
Additionally, physical damage to the regulator could break the pilot off the main valve, causing personal injury and
property damage due to bursting of pressure-containing parts. To avoid such injury and damage, install the regulator in a safe location.
All Installations
A Type EZL regulator bleeds no gas to atmosphere during normal operation, thus making the regulator suitable for installation in pits and other enclosed locations without elaborate venting systems. This
regulator also can be installed in pits subject to ooding
by venting the pilot spring case above the expected
ood level so that the pilot setting can be referenced to
atmospheric pressure.
1. Only personnel qualied through training and experience should install, operate and maintain a regulator. Before installation, make sure that there is no damage to or debris in the regulator. Also, make sure that all tubing and piping are clean and unobstructed.
6
Type EZL
Note
When upgrading Fisher® control valves, such as Types ET, ED and ES make sure

2. Install the regulator so that the ow arrow on the main valve matches the ow direction of process uid through the regulator.
3. Apply pipe comlb to the external pipeline threads before installing a regulator with threaded end connections. Use gaskets between pipeline and
regulator anges when installing a regulator with anged end connections. When installing buttweld
end connections, remove trim before welding and make sure to use approved welding practices. Use approved piping procedures when installing the regulator.
WARNING
!
A regulator may vent some gas to the

gas service, vented gas may accumulate, causing personal injury, death or property damage due to bursting of pressure-retaining parts. Vent a regulator in hazardous gas service to a remote, safe location away from air intakes or any hazardous location. The vent line or stack opening must be protected against condensation or clogging.
4. Pilots have a 1/4 in. NPT vent connection in the spring case. To remotely vent gas from the spring case, remove the screened vent and connect 1/4 in. / 6.4 mm piping or tubing to the spring case connection. The piping or tubing should vent to a safe location, have as few elbows as possible and have a screened vent on its exhaust. Install the regulator and any remote vent piping or tubing so that the vent is protected from condensation, freezing or substances that may clog it.
CAUTION
To avoid freezeup because of pressure drop and moisture in the gas, use anti­freeze practices, such as heating the supply gas or adding a de-icing agent to the supply gas.
5. Run a 3/8 in. / 9.5 mm outer diameter or larger pilot
supply line from the upstream pipeline to the lter
inlet as shown in Figure 3, bushing the line down
to t the 1/4 in. threaded NPT lter connection.
Do not make the upstream pipeline connection in a turbulent area, such as near a nipple, swage or elbow. If the maximum pilot inlet pressure could exceed the pilot rating, install a separate reducing regulator in the pilot supply line. Install a hand valve in the pilot supply line and provide vent valves to properly isolate and relieve the pressure from the regulator.
6. Attach a 1/2 in. / 12 mm piping or tubing downstream control line to the 1/2 in. threaded NPT control line connection on the actuator casings. Connect the other end of the control line to the pipeline downstream of the regulator. Do not attach the control line near any elbow, swage, block valve or any other location that might cause turbulence. Install a full port ball valve in the control line to shutoff the control pressure when using the bypass.
7. If a quick acting solenoid is to be installed downstream of a regulator, the regulator and solenoid should be located as far apart as practical. This will maximize the gas piping volume between the regulator and solenoid and improve the
regulator response to quick changing ow rates.
8. Consult the appropriate instruction manual for installation of an optional pneumatic or electric remote control drive unit. For optional remote pneumatic loading of a 6350 or 61 Series pilot, make the loading piping connections to the 1/4 in. NPT vent connection.
Wide-Open Monitor Regulator (Figure 4)
1. Follow the procedures in the All Installations section and then continue with step 2 of this section.
2. Connect the control line of the wide-open monitoring regulator to the downstream piping near the working regulator control line connection. During normal operation, the wide-open regulator stands wide-open with the pressure reduction
being taken across the working regulator. Only
in case of working regulator failure does the wide-open monitoring regulator take control at its slightly higher setting.
Regardless of which regulator is used as the monitor,
it should be equipped with a pilot supply regulator set to limit the pilot supply pressure to 10 to 15 psig /
0.69 to 1.0 bar above control pressure. Since the
7
Type EZL
pilot on the monitoring regulator is wide-open during normal operation, the pilot supply regulator is used to prevent differential pressure relief valve chatter on the monitoring regulator pilot.
Working Monitor Regulator (Figure 5)
1. Follow the procedure in the All Installations section and then continue with step 2 of this section.
2. Attach 3/8 in. / 9.5 mm tubing (for Types 161M and 161EBM) downstream control line to the control line (sense) connection on the pilot. Connect the other end of the control line to the pipeline downstream of the downstream working regulator. Do not attach the control line near any elbow, swage, block valve or any other location that might cause turbulence.
3. Apply pilot sense pressure by connecting the outlet of the monitor pilot to the inlet of the working monitor pilot.
Startup and Adjustment
Pre-startup Considerations
Each regulator is factory-set for the outlet pressure specied on the order. If no setting was specied, outlet pressure was factory-set at the mid-range of the pilot control spring. Before beginning the startup procedure in this section, make sure the following conditions are in effect:
• Block valves isolate the regulator
• Vent valves are closed
• A bypass, if any, is in operation
In all cases, check the control spring setting to make sure it is correct for the application.
CAUTION
Be sure to slowly introduce pressure into the system to prevent downstream overpressure due to potential rapid pressure increase. Pressure gauges should always be used to monitor downstream pressure during startup. Procedures used in putting this
regulator into operation must be planned accordingly if the downstream system is pressurized by another regulator or by a manual bypass.
Startup
1. Make sure all block valves, vent valves and control line valve(s) are closed.
2. Back out the pilot adjusting screw(s).
3. Slowly open the valves in the following order: a. Pilot supply and control line valve(s), if used. b. Inlet block valves.
4. Crack open the outlet block valve or bypass valve
to allow minimum ow.
5. For a single regulator, set the pilot to the desired outlet (control) pressure according to the Pilot Adjustment procedure.
For a wide-open downstream monitor installation, adjust the upstream working pilot until
intermediate pressure is higher than the desired setpoint of the monitor pilot. Adjust the downstream monitoring pilot to the desired monitoring takeover pressure. Reduce the upstream pilot to the normal outlet pressure setting.
For a wide-open upstream monitor installation, adjust the downstream working pilot to a setpoint higher than the setpoint of the monitor pilot. Adjust the downstream monitoring pilot to the desired monitoring takeover pressure. Reduce the upstream pilot to the normal outlet pressure setting.
For a working monitor installation, adjust the setpoint of the upstream monitor pilot to the desired maximum pressure. Adjust the upstream working pilot to the desired intermediate pressure setting. Adjust the downstream pilot to a pressure setting slightly above the upstream monitor pilot pressure setting. Adjust the upstream monitor pilot to its desired setpoint. Establish nal desired downstream pressure by adjusting the downstream working regulator pilot.
6. After adjusting the pilot(s) to the desired pressure setting(s), slowly open the downstream block valve wide-open.
7. Close the bypass valve, if used.
8
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