Emerson Type R622 Pressure Reducing Regulator Instruction Manual

2015-03-30

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Type R622

Instruction Manual
Form 5782
October 2009

Type R622 Pressure Reducing Regulator

W8806

Figure 1. Type R622 Regulator

Warning

Failure to follow these instructions or
to properly install and maintain this
equipment could result in an explosion
and/or fire causing property damage and
personal injury or death.
Fisher® regulators must be installed,
operated, and maintained in accordance
with federal, state, and local codes,
rules and regulations, and Emerson
Process Management Regulator
Technologies, Inc. instructions.
For LP-Gas service, an approved
regulator (such as one listed by UL)
should be used or approved by the
Authority Having Jurisdiction. The
installation in most states, must comply
with NFPA 58 standard.

If the regulator vents gas or a leak
develops in the system, service to the unit
may be required. Failure to correct trouble
could result in a hazardous condition.
Call a gas service person to service
the unit. Only a qualified person must
install or service the regulator.

Introduction
Scope of the Manual
This manual provides instructions for the installation,
adjustment, maintenance, and parts ordering information
for the Type R622 pressure reducing regulator.

Product Description
Type R622 direct-operated, spring-loaded regulators
provide economical pressure reducing control in
a variety of residential, commercial, and industrial
applications. These regulators can be used with
natural, manufactured, or liquefied petroleum gases and
have the same inlet and outlet pressure capabilities.

www.emersonprocess.com/regulators

D103093X012

Type R622
Specifications
Flow Coefficients
Wide-Open Cg for Relief Sizing: 12.5
Wide-Open Cv for Relief Sizing: 0.36
C1: 35

Body Size and End Connection Style
1/2 NPT
Maximum Allowable Inlet Pressure(1)
Operating: 125 psig (8,62 bar)

IEC Sizing Coefficients
XT: 0.78
FD: 0.82
FL: 0.89

Emergency: 125 psig (8,62 bar)
Except 1.8 to 2.2-inches w.c. (4 to 5 mbar) spring
range which has operating and emergency
pressures of 60 psig (4,14 bar)
Maximum Allowable Outlet (Casing) Pressure(1)
Operating to Avoid Internal Part Damage:
3 psid (0,21 bar d) above outlet pressure setting
Emergency: 20 psi (1,38 bar)
Outlet Pressure Ranges
See Table 1

Internal Relief Performance
Start-to-Discharge is 8 to 22-inches w.c.
(20 to 55 mbar) for setpoints from
1.8 to 20-inches w.c. (4 to 50 mbar)
Start-to-Discharge is 140 to 200% over setpoint
from 20-inches w.c. to 2.2 psig (50 to 152 mbar)
Spring Case Vent Connection
3/4 NPT with removable screen

Pressure Registration
Internal

Maximum Temperature Capabilities(1)
-20° to 160°F (-29° to 71°C)

Orifice Size
1/8-inch (3,2 mm)

Approximate Weight
2.35 pounds (1 kg)

1. The pressure/temperature limits in this instruction manual or any applicable standard limitation should not be exceeded.

Table 1. Outlet Pressure Ranges

outlet pressure range
1.8 to 2.2-inches w.c.
5 to 7-inches w.c.
6.5 to 9-inches w.c.
9 to 13-inches w.c.
13 to 20-inches w.c.
16 to 35-inches w.c.
1 to 2.2 psig

(4 to 5 mbar)
(12 to 17 mbar)
(16 to 22 mbar)
(22 to 32 mbar)
(32 to 48 mbar)
(40 to 87 mbar)
(69 to 152 mbar)

control spring
part number

control spring
color code

T14453T0012
T14398T0012
T14399T0012
T14400T0012
T14401T0012
T14402T0012
T14403T0012

Purple
Orange
Yellow
Silver
Gray
Pink
Light Blue

SPRING FREE LENGTH,
Inches (mm)
3.40
3.40
3.61
4.10
3.60
3.52
3.66

(86,4)
(86,4)
(91,7)
(104)
(91,4)
(89,4)
(93,0)

SPRING WIRE DIAMETER,
Inches (mm)
0.051
0.062
0.067
0.072
0.080
0.093
0.105

(1,30)
(1,58)
(1,70)
(1,83)
(2,03)
(2,36)
(2,67)

TypeR622
XXXX
Type

Month Year

Type XXXX

CONTROL
(MAIN) SPRING

RELIEF VALVE
SPRING

UPPER SPRING CASE

ORIFICE
ATMOSPHERIC
PRESSURE
INLET
PRESSURE
INLET
PRESSURE
OUTLET
PRESSURE
OUTLET
PRESSURE
OUTLET
PRESSURE
ATMOSPHERIC
PRESSURE
INLET
PRESSURE
ATMOSPHERIC
PRESSURE

STEM

MXXXX

VALVE DISK

LEVER

Figure 2. Type R622 Operational Schematic

In addition, Type R622 regulators have internal relief
across the diaphragm to help minimize overpressure.
Any outlet pressure above the start-to-discharge point
of the nonadjustable relief valve spring moves the
diaphragm off the relief valve seat, allowing excess
pressure to bleed out through the screened spring
case vent.

Specifications
The Specifications section lists operating conditions
and other specifications of the Type R622 regulator.
Information specific to a regulator’s construction is
stamped on the nameplate.

Principle of Operation
Refer to Figure 2. When downstream demand
decreases, the pressure under the diaphragm
increases. This pressure overcomes the regulator
setting (which is set by a spring). Through the action
of the pusher post assembly, lever, and valve stem,
the valve disk moves closer to the orifice and reduces
gas flow. If demand downstream increases, pressure
under the diaphragm decreases. Spring force
pushes the pusher post assembly downward and the
valve disk moves away from the orifice. Type R622
regulators include an internal relief valve used to help
minimize overpressure. Any outlet pressure above

the start-to-discharge point of the non-adjustable
relief spring moves the diaphragm off of the relief
seat, allowing excess pressure to discharge through
the vent.

Installation
!

Warning

Personal injury, equipment damage,
or leakage due to escaping gas or
bursting of pressure-containing parts
might result if these regulators are
overpressured or installed where
service conditions could exceed the
limits for which the regulators were
designed, or where conditions exceed
any ratings of the adjacent piping or
piping connections. To avoid such
injury or damage, provide pressurerelieving or pressure-limiting devices
(as required by the appropriate code,
regulation or standard) to prevent
service conditions from exceeding
those limits.
Additionally, physical damage to a
regulator could cause personal injury
and property damage due to escaping
3

Type R622
gas. To avoid such injury and damage,
install the regulator in a safe location.

to appliance

A regulator may vent some gas to the
atmosphere in hazardous or flammable
gas service, vented gas might accumulate
and cause personal injury, death or
property damage due to fire or explosion.
Vent a regulator in hazardous gas service
to a remote, safe location away from
air intakes or any hazardous location.
The vent line must be protected against
condensation or clogging.
Before installing the regulator, check for damage
which might have occurred in shipment. Also check
for dirt or foreign matter which may have accumulated
in the regulator body or in the pipeline. Apply pipe
compound to the external threads of the pipeline and
install the regulator so that the flow is in the direction
of the arrow cast on the side of the body. The
diaphragm actuator assembly can be rotated to any
position relative to the body, in 90° increments.
Do not install the regulator in a location where there
can be excessive water accumulation, such as directly
beneath a downspout or in an undrained pit.
To obtain the maximum flow capacities or other
performance characteristics, the length of pipe from the
regulator outlet to the meter—or for the first 18-inches
(457 mm), whichever is closer—should have no bends
and should be the same size as the regulator outlet.
Replace the regulator if water gets into the spring case
or the lower casing of the regulator.
Type R622 regulators have a spring case vent
(3/4 NPT) which is screened to prevent insects or
foreign material from entering.

caution
You are advised to use new vent piping
because defective threads on the relief
vent piping may interfere with the venting
assembly if the piping obstructs the
movement of the vent flapper.
On indoor installations, the vent should be piped
outside the building, see Figure 3. Remove the screen
from the regulator vent connection and connect vent
piping from that connection to the outdoors. Vent
piping should be as large in diameter as practical, be
as short as possible, and have a minimum number
of bends and elbows. Install a weather and insect
resistant vent assembly on the outside end of the
pipe, such as a Type Y602. The same installation

vent assembly

vent line

basement

B2497

Figure 3. Typical Vent Line Installation

precautions apply to vent assemblies as the integral
regulator vents described previously.
A program of regular inspection of the vent opening
should be established to see that it has not become
plugged by foreign material. On some installations,
such as in areas of heavy snowfall, it may be
necessary to install the regulator beneath a protective
hood. If other protection is provided from the elements,
the vent should be pointing or sloping down sufficiently
to allow any condensate to drain. Also check the
regulator periodically for external or internal corrosion.

Overpressure Protection
!

Warning

Some type of overpressure protection
is needed if actual inlet pressure can
exceed the outlet pressure rating.
Overpressuring any portion of this
equipment above the limits given in the
Specification section and table 1 may
cause damage to regulator parts, leaks
in the regulator, or personal injury due to
bursting of pressure-containing parts or
explosion of accumulated gas.
Type R622 regulators provide internal relief that limits
the total outlet pressure build-up over setpoint. This
internal relief may be adequate for most application,
if not, provide additional pressure relief or a pressurelimiting device downstream. Regulators should be
inspected for damage after any overpressure condition.

Type R622
Startup
!

Warning

To avoid personal injury or property
damage due to explosion or damage to
regulator or downstream components
during startup, release downstream
pressure to prevent an overpressure
condition on the diaphragm of
the regulator.
In order to avoid an overpressure
condition and possible equipment
damage, pressure gauges should
always be used to monitor pressures
during startup.
1. Check to see that all appliances are turned off.
2. Slowly open the upstream shutoff valve.
3. Slowly open the downstream shutoff valve
4. Check all connections for leaks.
5. Make final control spring adjustments according to
the adjustment procedures.
6. Light the appliance pilots.

Adjustment
To increase the outlet pressure setting of the regulator,
the adjusting screw (key 23, Figure 5) must be turned
clockwise. This requires removal of the closing cap
(key 31, Figure 5). To reduce the outlet pressure
setting, turn the adjusting screw counterclockwise.
A pressure gauge should always be used to monitor
downstream pressure while adjustments are being
made. Do not adjust the spring to produce an outlet
pressure setting above the limit identified on the
information label. If the required pressure setting is not
within the range of the spring being used, substitute
with the correct spring, see Table 1. When changing
the spring, also change the range identified on the
information label to indicate the actual pressure range
of the spring in use. After the spring adjustment has
been completed, replace the closing cap.

Shutdown
!

Warning

To avoid personal injury or property
damage due to explosion or damage to
regulator or downstream components
during shutdown, release downstream
pressure to prevent an overpressure
condition on the regulator diaphragm.

Installation arrangements may vary, but in any
installation it is important that the valves be
opened or closed slowly. These steps apply to the
typical installation.
1. Slowly close the downstream shutoff valve.
2. Slowly close the upstream shutoff valve.
3. Open vent valves downstream of the regulator.
4. Open vent valves upstream of the regulator.

Maintenance
!

Warning

Avoid personal injury or damage to
property from sudden release of pressure
or uncontrolled gas or other process
fluid. Before starting to disassemble,
isolate the regulator from all pressure and
cautiously release trapped pressure from
the regulator. Use gauges to monitor
inlet, loading and outlet pressures while
releasing these pressures.
These procedures are for gaining access to the
diaphragm, valve disk and orifice. All pressure must be
released from the diaphragm actuator assembly before
the following steps can be performed.
While using the following procedures, refer to Figure 5
for key number locations.

Diaphragm and Disk Replacement
1. Remove the closing cap (key 31) and adjusting
screw (key 23).
2. Remove the spring case machine screws (key 4) out
of the spring case (key 25), and remove the spring
case and control spring (key 22).
3. Lift the diaphragm assembly slightly, and slide it
away from the lever (key 27), so that the pusher
post (key 18) releases the lever.
4. Remove the diaphragm assembly (key 17). Examine
the diaphragm assembly, replace if necessary.
5. Reassemble in the reverse order of the above
procedures. Place the diaphragm assembly into
position in the body (key 1), being sure the pusher
post is properly hooked on the lever (key 27).
Rotate the diaphragm so that the diaphragm and
lower casing holes align. Check the diaphragm
for proper orientation. Tighten the spring case
machine screws (key 4) to 15 to 30-inch-pounds
(2 to 4 N•m).
6. To remove the disk follow steps 1 through 4.
7. Remove screws (key 4).
5

Type R622
8. Remove lever (key 27)
9. Remove stem assembly (key 28)
10. Remove disk (key 33) from stem assembly
(key 28). Examine the disk. If it is nicked, cut, or
otherwise damaged, the disk should be replaced.
11. Put together in reverse order.

Inlet Screen and Orifice Replacement

Parts Ordering
The type number, orifice size, spring range, and date
of manufacture are located on the spring case. Always
provide this information in any correspondence with
your local Sales Office regarding replacement parts
or technical assistance. If construction changes are
made in the field, be sure that the information label is
also changed to reflect the most recent construction.

1. Remove the regulator from line.

Parts List

2. Remove machine screws (key 4).

Key Description

3. Remove inlet O-ring (key 5). Lubricate a new inlet
O-ring and place on inlet fitting (key 3).

1
Body, Aluminum
2
Pipe Plug, Carbon steel (2 required)
3
Inlet Fitting, Aluminum
4
Machine Screw, Carbon Steel (12 required)
5
O-Ring, Nitrile (NBR)
13 Inlet Screen, 18-8 Stainless steel
16 Relief Spring, 302 Stainless steel
17 Diaphragm
18 Pusher Post, Acetal
19 Lower Spring Seat, Zinc-plated steel
20 Relief Spring Retainer, 18-8 Stainless steel
22 Spring, Zinc-plated steel
23 Adjusting Screw, Delrin®
For use with inches w.c. springs
For use with psig spring
24 Orifice, Aluminum
25 Spring Case Assembly, Aluminum
26 Vent Screen, 18-8 Stainless steel
27 Lever, Zinc-plated steel
28 Stem Assembly
29 Pin Lever, 18-8 Stainless steel
30 Machine Screw, Carbon-plated steel (2 required)
31 Closing Cap
33* Disk, Nitrile (NBR)
38 O-Ring, Nitrile (NBR)
41 Information Label

4. Remove inlet screen (key 13). Clean and/or
replace the inlet screen, if necessary.
5. Install the inlet screen (key 13) and inlet fitting
(key 3). Then install and tighten the machine
screws (key 4) to 15 to 30-inch-pounds-force (2 to
4 N•m).
6. To replace the orifice, follow steps 1 through 4,
and then remove orifice (key 24) from body.
Examine the seating edge of the orifice. If it is
nicked or rough, it should be replaced. Treat the
external threads of the new orifice with lubricant
before reassembling, tightening to 15 to
20-inch-pounds (2 to 3 N•m) of torque.
7. Install the inlet screen (key 13) and inlet fitting
(key 3). Then install and tighten the machine
screws (key 4) to 15 to 30-inch-pounds-force
(2 to 4 N•m).

*Recommended spare part
Delrin® is a mark owned by E.I. du Pont de Nemours and Co.

Part Number
T80567T0GY2
1D8293T0022
T21176T0BK2
T13526T0012
T14431T0012
T14436T0012
T13612T0012
T21163T0012
T40653T0012
T14396T0012
T13613T0012
See Table 1
T21186T0012
T21202T0012
T21126T0012
T40655T0022
T1121338982
T21197T0012
T14452T0012
T14397T0012
1E175828982
T21187T0012
T14437T0012
T14422T0012
-----------

Type R622

Position 1
Vent over inlet

Position 4

Position 2

Position 3
Vent over outlet

T80577

Figure 4. Vent Location

16
3

27 18

T80577

Figure 5. Type R622 Regulator Assembly

Type R622
22

20
41

7 18

2
Figure 5. Type R622 Regulator Assembly (continued)

Industrial Regulators

Natural Gas Technologies

TESCOM

Emerson Process Management
Regulator Technologies, Inc.

Emerson Process Management
Tescom Corporation

USA - Headquarters
McKinney, Texas 75069-1872 USA
Tel: 1-800-558-5853
Outside U.S. 1-972-548-3574

USA - Headquarters
Elk River, Minnesota 55330-2445 USA
Tel: 1-763-241-3238

Asia-Pacific
Shanghai, China 201206
Tel: +86 21 2892 9000

Asia-Pacific
Singapore, Singapore 128461
Tel: +65 6777 8211

Europe
Bologna, Italy 40013
Tel: +39 051 4190611

Europe
Bologna, Italy 40013
Tel: +39 051 4190611
Gallardon, France 28320
Tel: +33 (0)2 37 33 47 00

Middle East and Africa
Dubai, United Arab Emirates
Tel: +971 4811 8100

Europe
Selmsdorf, Germany 23923
Tel: +49 (0) 38823 31 0

For further information visit www.emersonprocess.com/regulators
The Emerson logo is a trademark and service mark of Emerson Electric Co. All other marks are the property of their prospective owners. Fisher is a mark owned by Fisher Controls, Inc., a
business of Emerson Process Management.
The contents of this publication are presented for informational purposes only, and while every effort has been made to ensure their accuracy, they are not to be construed as warranties or
guarantees, express or implied, regarding the products or services described herein or their use or applicability. We reserve the right to modify or improve the designs or specifications of such
products at any time without notice.
Emerson Process Management does not assume responsibility for the selection, use or maintenance of any product. Responsibility for proper selection, use and maintenance of any Emerson
Process Management product remains solely with the purchaser.

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