FL Series
D103068X012
Instruction Manual
Form 5733
July 2004
www.FISHERregulators.com
FL Series Pressure Reducing Regulators
Introduction
Scope of Manual
This manual provides instructions for installation,
adjustment, maintenance, and parts ordering for the FL
Series regulators.
Description
The FL Series regulators are accurate pilot-operated,
pressure balanced, soft seated regulators designed for
high pressure transmission/city gate, large capacity
distribution systems and power plant feeds. The FL
Series provides smooth, quiet operation, tight shutoff and
long life. The regulator utilizes a main valve actuator, a
Type PRX pressure reducing pilot, and a Type SA/2 pilot
supply pressure regulator. The Type PRX pilot uses inlet
pressure reduced by a Type SA/2 supply pressure
regulator, as loading pressure to operate the main valve
actuator. The outlet pressure is sensed through a
control line on the main valve actuator and also on the
Type PRX pilot diaphragm.
Specifications
The Specifications section gives some general specifi-
cations for the FL Series regulators. The nameplates
give detailed information for a particular regulator as it
comes from the factory.
Type FL
E0820
Type MFL with Type SRS Silencer
E0821
Figure 1. Type FL and Type MFL with Type SRS Silencer
