Low Pressure Back Pressure Valves

For service on air, water, oil and other non-corrosive liquids and gases. Sizes: 1/2", 3/4", 1", 11/4"


Controls up to 25 psi. Automatically maintains desired pressure in a line or system by discharging
excess pressure to the atmosphere or to a lower pressure system. All bronze, neoprene-nylon
diaphragm, composition disc, sensitive adjusting spring. On installation, a “T” is placed in the inlet line
and a sensing connection is run from it to the top of the valve.
FR, FR-6, FR-10
0 to 600 psi Back Pressure Valves

Centrifugal, regenerative turbine, reciprocating or rotary pump bypass valve. Protects pump systems
from over pressure.

Sizes: 1/2", 3/4", 1", 11/4", 11/2", 2"


Protects against periodic high pressures; maintains a desired inlet pressure by relieving to a lower
variable pressure, or to atmosphere. Relieves dependably at adjusted pressures; shuts tight after
relieving. Features unique “Floating Ring” seating arrangement that produces perfect seat contact.
The FR valves afford unusually close regulation, repeatability of opening pressure and close
reseating pressures.The FR-10 is for more economical, lower pressure applications — maximum
pressure setting 250 psi. (Provided with iron body and spring housing only). Type FR is available in
iron, bronze, steel or stainless steel body; threaded connections; monel, stainless steel or BUNA-N
diaphragm. Pressure settings from 0 to 400 psi. The FR-6 is available for 200 to 600 psi.
Small Back Pressure Valves

For service on liquids, air and gases not corrosive to brass. Recommended for bypass regulation
on fuel oil systems, compressor governor pilot control, and many small to medium pumping system
bypass jobs. Ideally suited for many applications in the cryogenic field.


1/8", 1/4", 3/8" FRM
1/4", 3/8", 1/2" FRM-2


Automatically maintains a constant inlet or back pressure. Functions as a pressure limiting
regulator, not as a safety device. Bronze body, stainless steel seat ring and disc.
©2013 Towle Whitney LLC
Plumbing Heating & Industrial
Valves and Controls