Brochure

Tunstall Corporation
118 Exchange Street • Chicopee, MA 01013
© July 2014
We reserve the right to alter designs, specifications and information without notice.
Phone [phone] · Fax [phone]
www.tunstall-inc.com • www.maconcontrols.com
Bulletin-DR-0714
Valves
DIFFERENTIAL PRESSURE VALVE
DR 15
The DR 15 pressure differential pressure valve
has a proportional control characteristic, opening
with rising differential pressure. It is suitable for
installation in circulated pumped radiator circuits
equipped with radiator thermostatic valves. Used
with hot water systems.
OPERATION
Design: flow regulation with cap for concealed
setting. At a given setting (number of turns “n”)
of the valve spindle and a given differential pres-
sure, a given amount of water flows through the
valve. If the differential pressure rises, e.g. when
one or more radiators are shut off, the through-
flow rate increases, relieving the pump pressure
on the remaining valves.
Two pressure ranges available: 0-2.9 PSI and 0-
8.7 PSI.
ADVANTAGES
• Regulates pressure changes in single and dou-
ble pipe systems due to thermostatic radiator
valve settings.
• Eliminates rushing noise and chattering in
radiator thermostatic valves.
• Easy to fit.
DATA
Material: Hot forged brass
Design: Straight connection, 1/2 NPT
Max. Temperature: 250°F
Max. Static Pressure: 145 psi
Application example
DR 15 valve installed in central heating system
with 3- or 4-way shunt valve.