Brochure

Components for today’s modern hydronic systems
520 SERIES
PRE-ADJUSTABLE PRESSURE
REDUCING VALVES
PRODUCT FEATURES
High ow and quiet pressure control
The Caleffi 535H pressure reducing valve is precision engineered to deliver accurate pressure regulation under
varying pressure and draw conditions. Low internal pressure losses produce superior falloff performance
enabling more flow capacity to fixtures. NSF 61 certification, superior 180°F temperature rating, anti-scale
components and convenient cartridge design add to the many features of this versatile and dependable PRV.
Protecting the system to protect your water
535H SERIES
 Pre-adjustment knob:
15 to 90 psi adjustment range with
convenient psi setting visible from front and
back. Includes tamper-proof locking screw.
Removable self-contained cartridge with
stainless steel mesh lter:
Maximum debris protection and convenient
in-pipe maintenance and servicing.
Conical seat and shuttle design:
Together with large cross-section flow
chamber, minimizes pressure drop within
valve. Results in superior falloff performance
compared to competitors and quiet operation.
Contour-shaped peroxide-cured diaphragm:
Enables accurate pressure regulation under
frequent and sudden pressure fluctuations, a
common cause of premature valve wear.
Precision engineering:
Tight manufacturing tolerances creates very
uniform 360º flow past conical seat. Prevents
wire draw erosion during low flow conditions,
a common cause of upward system pressure
creep during no-demand periods.
Hot water boost system compatible:
Rated to 180ºF. Scale resistant internal parts
to prevent flow inconsistencies. Certified to
NSF 61, ASSE 1003, CSA B356 and NSF
372.