Emerson Fisher S202, Fisher S201H, Fisher S201, Fisher S202H, Fisher S201K Instruction Manual

Instruction Manual
Form 5171

October 2009

S201 and S202 Series

S201 and S202 Series Gas Regulators

W1919

Figure 1. Typical S200 Gas Regulator

WARNING

!

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 U.L.)
should be used. The installation,
in most states, must comply with
NFPA standards.

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 qualied person must

install or service the regulator.

Introduction

Scope of the Manual

This instruction manual provides instructions for
installation, adjustment, maintenance, and parts
ordering information for Types S201, S201H, S201K,
S202, and S202H gas service regulators.

Description

S201 and S202 Series regulators are typically
installed on industrial and commercial applications.
The Types S202 and S202H regulators contain an

internal relief valve. Units with an “H” or “K” sufx

are similar to the basic regulators but deliver a higher
outlet pressure of 1 to 5 psig (69 mbar to 0,35 bar) and
2 to 10 psig (0,14 to 0,69 bar), respectively.

Specications

The Specications section lists the specications for

the regulators. The following information is stamped
on the regulator at the factory: type number, date of

manufacture, spring range, orice size, maximum inlet
pressure, maximum operating outlet pressure, and

outlet pressure which may damage regulator parts.

www.emersonprocess.com/regulators

D400007X012

S201 and S202 Series

Type S202

Specications

Available Congurations

See Figure 3
Body Size and End Connection Styles

1-1/2 or 2 NPT inlet and outlet and

NPS 2 (DN 50) CL125 FF anged

Maximum Allowable Inlet Pressures

(1)

See Table 1

Maximum Emergency Outlet Pressure

15 psig (1,0 bar)

Outlet Pressure Range

(1)

Orice Size

1/4, 3/8, 1/2, 3/4, 1, and 1-3/16-inches
(6,4; 9,5; 13; 19; 25; and 30 mm)

Temperature Capabilities

-20° to 150°F (-29° to 66°C)

Pressure Registration

Internal

Approximate Weight

22 pounds (10 kg)

2.0-inches w.c. to 10 psig (5 mbar to 0,69 bar)

1. The pressure/temperature limits in this Instruction Manual and any applicable standard or code limitation for valve should not be exceeded.

CONTROL
SPRING

VALVE DISK

DIAPHRAGM

RELIEF VALVE
SPRING

VALVE DISK

DIAPHRAGM

PUSHER POST

A6197 A6198

INLET PRESSURE

OUTLET PRESSURE

ATMOSPHERIC PRESSURE

ORIFICE

TYPE S201 TYPE S202

Figure 2. Operational Schematics

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 the control spring). Through
the action of the pusher post assembly, lever, and

valve stem, the valve disk moves closer to the orice
and reduces gas ow. 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

orice, and the gas ow increases.

The Types S202 and S202H regulators include an
internal relief valve. Internal relief is 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.

Typical start-to-discharge values are 7-inches w.c. to
2 psi (17 to 138 mbar) above the outlet pressure
setting, depending on control spring used.

PUSHER POST

ORIFICE

2

S201 and S202 Series

TYPE NUMBER

S 2 0

REGULATOR TYPE

1 Regulator, 2 to 30-inches w.c. (5 to 75 mbar) outlet range

2 Regulator, 2 to 30-inches w.c. (5 to 75 mbar) outlet range with Internal Relief

PRESSURE OUTLET RANGE

H High-Pressure Regulator, 1 to 5 psi (0,07 to 0,34 bar) outlet range with heavy diaphragm plate

K High-Pressure Regulator with external adjusting screw, 2 to 10 psi (0,14 to 0,69 bar) outlet range (Not an option for S202)

Installation

WARNING

!

Personal injury or system damage
may result if this regulator is installed,
without appropriate overpressure
protection, where service conditions
could exceed the limits given on the

Specications section and regulator

nameplate. Regulator installations
should be adequately protected from
physical damage.

All vents should be kept open to permit

free ow of gas to the atmosphere.

Protect openings against entrance of
rain, snow, insects, or any other foreign
material that may plug the vent or vent
line. On outdoor installations, point the
spring case vent downward to allow
condensate to drain (see Figure 4). This
minimizes the possibility of freezing and
of water or other foreign materials from
entering the vent and interfering with
proper operation.

Under enclosed conditions or indoors,
escaping gas may accumulate and be
an explosion hazard. In these cases,
the vent should be piped away from the
regulator to the outdoors.

OPTIONS

Figure 3. Available Congurations

AJ4698
A1121

Figure 4. Type S201 Regulator Installed with the Vent

Pointed Downward and with a Type 289H Relief Valve for

any portion of the regulators beyond the

limits in the Specications section and

Table 1 may cause leakage, damage to
regulator parts, or personal injury due to
bursting of pressure-containing parts.

Some type of external overpressure
protection should be provided if inlet
pressure will be high enough to damage
downstream equipment. Common
methods of external overpressure
protection include relief valves,
monitoring regulators, shutoff devices,
and series regulation.

TYPE S201
REGULATOR

PROTECT VENT PIPE
WITH RAIN CAP

High Capacity Relief

NPS 2 (DN 50)
TYPE 289H
RELIEF VALVE

CAUTION

S201 and S202 Series regulators have
an outlet pressure rating lower than
their inlet pressure rating. If actual inlet
pressure can exceed the outlet pressure
rating, outlet overpressure protection
is necessary. However, overpressuring

If the regulator is exposed to an
overpressure condition, it should be
inspected for any damage that may
have occurred. Regulator operation

below these limits specied in the
Specications section and Table 1 does

not preclude the possibility of damage
from external sources or from debris in
the pipeline.

3