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Jordan Valve Mark 5108 Series Back Pressure Regulator User Manual

I & m mark 5108 series, Ntroduction

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4.

Flow Control Valve,

a needle-type valve

which provides adjustable, restricted flow in

one direction, and free flow in the opposite

direction. On the Mark 5108, the flow control

valve is connected as a closing speed

control.

5.

The Y-Strainer (standard on water

service valves) or Mark 5123 Inline Strainer

(standard on fuel service valves). The strainer

protects the pilot system from solid

contami nants in the line fluid.

6.

Two Ball Valves (standard on water service

valves, optional on fuel service valves), useful

for isolating the pilot system for maintenance

or trouble shooting.

At user option, the 5108 may also be equipped with

the following:

1.

Visual Indicator.

2.

Limit Switch Assembly (includes visual

indicator).

3.

Opening Speed Control.

I

ntroductIon

The Mark 5108 may be generically described as

a back pressure control valve, i.e., it controls the

pressure at its inlet. With this type of control, the

Mark 5108 may be employed in two different ways:

1.

As a Pressure Relief Valve

. Here the 5108

is installed on a bypass from a main line. It

opens to relieve any pressure above its set

point.

2.

As a Pressure Sustaining Valve

. Here the

Mark 5108 is installed in the main line itself. It

functions to control the incoming pressure at

the set point, or more commonly, to prevent

the pressure from falling below a

predetermined minimum. For example, it may

be installed on the discharge of a pump to

ensure that the pump remains "on its curve."

The Mark 5108 consists of the following components,

arranged as shown on the schematic diagram:

1.

Basic Control Valve

, a hydraulically

operated, diaphragm-actuated, globe or

angle valve which closes with an elastomer-on-

metal seal.

2.

Pressure Relief Pilot,

a two-way, normally

closed pilot valve which senses up-stream

presure under its diaphragm and balances it

against an adjustable spring load. An increase

in upstream pressure tends to make the pilot

open.

3.

Ejector

, a simple "tee" fitting with a fixed orifice

in its inlet port. It provides the proper pressure to

the diaphragm chamber of the main valve

depending on the position of the pressure relief

pilot.

3170 Wasson Road • Cincinnati, OH 45209
Phone 513.533.5600 • Fax 513.871.0105 (f)
[email protected] • www.jordanvalve.com

I & M Mark 5108 Series

Installation & Maintenance Instructions for the

Mark 5108 Back Pressure Regulating Valve

Warning: Jordan Valve Control Valves must only be used, installed and repaired in accordance with these Installa-
tion & Maintenance Instructions. Observe all applicable public and company codes and regulations. In the event
of leakage or other malfunction, call a qualified service person; continued operation may cause system failure or
a general hazard. Before servicing any valve, disconnect, shut off, or bypass all pressurized fluid. Before disassem-
bling a valve, be sure to release all spring tension.