Emerson Tartarini PRX/120 User Manual

PRX Series
D103231X012
Instruction Manual
Form 5862
October 2015
www.tartarini-naturalgas.com
PRX Series Pilots for Pilot-Operated Pressure
Reducing Regulators
Introduction
Scope of the Manual
This manual provides installation, startup, maintenance and
parts ordering information for the PRX Series pilots and
Type SA/2 filter used together with Pilot-Operated Pressure
Reducing Regulators for high pressure applications.
For information on mounting on Pilot-operated Regulators,
monitoring systems and installations, refer to full
product literature:
Type EZH: D103077X012
Type EZR: D102600X012
Type FL: D103068X012
Product Description
The PRX Series pilots are mainly used in natural gas, air or
other non-corrosive gas applications. They have a double
diaphragm which provides increased accuracy and sensitivity,
an integral damper screw to adjust opening and closing
speeds and a restrictor screw to adjust pilot gain.
The PRX Series pilots can be also be used in other
applications such as relief valve or backpressure regulators
and as a quick dump pilot.
Furthermore, PRX Series pilots have the ability to handle
a wide range of setpoints, from 14.5 to 1160 psig / 1.00 to
80.0 bar.
Type SA/2 Pilot Supply Filter Regulator
The PRX Series pilots are usually used together with the
Type SA/2 pilot supply filter regulator. The Type SA/2
provides a constant supply pressure to the PRX Series pilot
that is approximately 45 psi / 3.1 bar over set pressure. The
Type SA/2 has an integral 5 micron filter.
TYPE PRX-120 TYPE PRX-120/AP TYPE PRX-182
W8346
W8348
P1666
Figure 1. PRX Series Pressure Reducing Pilots

Emerson Tartarini PRX/120 Specifications

General

Type	Pressure Regulator
Series	PRX
Model	PRX/120
Connection Type	NPT
Diaphragm Material	NBR
Operating Temperature	-20 to 60°C
Application	Industrial and commercial applications, natural gas distribution

Summary

Introduction

Scope of the Manual

Details installation, startup, maintenance, and parts ordering for PRX Series pilots and Type SA/2 filter.

Product Description

Explains PRX Series pilots used in gas applications, featuring a double diaphragm for accuracy.

Specifications

Maximum Inlet Pressures

Defines the maximum allowable inlet pressure for PRX Series pilots.

Outlet (Control) Pressure Ranges

Lists the various outlet pressure ranges for different PRX Series pilot models.

Accuracy Class

Specifies the accuracy class for the PRX Series pilot models.

Temperature Capabilities

Indicates the operational temperature range for the PRX Series pilots.

Pilot and Filter Regulator Flow Coefficients

Provides flow coefficients for PRX pilots and the SA/2 filter regulator.

Threaded Connections

Specifies the type of threaded connections used on PRX Series pilots.

Orifice Size

Details the standard orifice size for PRX Series pilots.

Type SA/2 Allowable Pressure

States the maximum allowable pressure for the Type SA/2 filter regulator.

Options

Lists available options for the PRX Series pilots, such as pilot supply filters.

Available Configurations

Type PRX/120

Describes the PRX/120 pilot's pressure range and applications.

Type PRX/120-AP

Details the PRX/120-AP pilot's pressure range and applications.

Type PRX/125

Explains the PRX/125 pilot, its difference from PRX/120, and usage.

Type PRX/125-AP

Describes the PRX/125-AP pilot and its monitor override function.

Type PRX/131

Details the PRX/131 pilot's use as a booster or quick dump pilot.

Type PRX-AP/131

Explains the PRX-AP/131 pilot for booster/quick dump applications.

Type PRX/182

Describes the PRX/182 pilot's use in relief or backpressure regulators.

Type PRX-AP/182

Details the PRX-AP/182 pilot for relief/backpressure applications.

Principle of Operation

Types PRX/120 and PRX/125

Explains the operational principle for PRX/120 and PRX/125 pilots.

Type PRX/131 Pilot

Describes the operational principle of the PRX/131 pilot as a quick dump pilot.

Type PRX/182 Pilot

Explains the operational principle of the PRX/182 pilot for relief valve use.

Adjustment

Installation

Startup and Adjustment for Types PRX/120 and PRX/125

Prestartup Considerations

Lists conditions to check before starting up PRX/120 and PRX/125 pilots.

Pilot Adjustment for Types PRX/120 and PRX/125

PRX Series Pilot Restrictor and Damper Screw Adjustment

Shutdown

Maintenance for Types PRX/120 and PRX/125

Lower Case Maintenance

Provides steps for disassembling and maintaining the lower case of the pilot.

Upper Case Maintenance

Damper and Restrictor Maintenance

The Types PRX/131 and PRX/182 Maintenance

Lower Diaphragm Maintenance

Upper Diaphragm Maintenance

Type SA/2 Pilot Supply Filter Regulator

Type SA/2 Pilot Supply Filter Regulator (Figure 5)

Details maintenance and parts for the Type SA/2 pilot supply filter regulator.

Parts Kits

Lists elastomer parts kits for the Type SA/2 filter regulator.

Parts Ordering

Parts List

PRX Series Pilots (Figure 2)

Lists part numbers and descriptions for PRX Series pilot components.

Parts Kits

Details elastomer and other parts kits available for PRX Series pilots.