Brochure

Tunstall Corporation
118 Exchange Street • Chicopee, MA 01013
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
Setting the differential pressure
Turn the valve spindle (see fig.) until it is wide open.
Locate the maximum differential pressure of the pump
on the vertical axis of the graph and draw a horizontal
line to intersect the “n” line corresponding to the re-
quired flow rate according to the horizontal axis.
Then turn the valve spindle clockwise the number of
turns indicated by the selected “n” line.
The DR 15 pressure relief valve is delivered with a
spring for a differential pressure range of 0-2.9 PSI in
place. To alter the range to 0-8.7 PSI, exchange the
spring in the valve for the separate one delivered with
it.
Spring for 0.1-0.6 bar (10-60KPA) pressure range.
Spring for 0-0.2 bar (0-20KPA) pressure range.
KiloPASCALS - kPa x 0.1450 = pounds force per sq. inch.
BARS - bar x 14.504 = pounds force per sq. inch.
Reference numbers for ordering
Art. No. Code Conn. No. Thread
4141501 DR 15 15 1/2” NPT
Compression fittings must be ordered separately.