Product Overview
Working pressures
The zone exposed to upstream pressure is constructed so that it can
operate at high pressure. The PTFE heavy duty rings
on the compensating
piston make it possible for the valve to be used continuously at upstream
pressures up to 300 psi.
Non-sticking materials
The central support assembly, containing moving parts, is made of
plastic material with a low adherence coefficient. This minimizes the
formation of lime scale, a common cause of flow inconsistencies.
Stainless steel stem
The stainless steel stem minimizes the harmful affects associated with
the use of hard and aggressive water.
Contoured diaphram
The diaphragm is designed with a special shape to assure more
accurate pressure regulation in accordance with downstream
pressure fluctuations.This feature also extends the life of the valve,
since the diaphragm is more resistant to sudden pressure fluctuations
and to normal wear. The diaphragm and seals in the 535H series are
peroxide-cured EPDM that is resistant to water treated with chlorine
or chloramine for longer operating life.
Compact dimensions
The “inclined” configuration makes the 535HA series pressure
reducing valves compact for easy installation, especially in domestic
water systems.
Removable self-contained cartridge
The cartridge containing the diaphragm, filter, seat, shuttle and
compensating piston is a pre-assembled self-contained unit with a
cover, and can be removed to facilitate inspection and maintenance
procedures.
The special construction of the regulating element does not require
any modification of the setting pressure value, which may be left
unchanged.
High temperatures
The materials used for the construction of the 535H series pressure
reducing valves allow installation also on hot water booster circuits
with temperatures up to 180°F (80°C).
Pressure gauge
The pressure gauge (optional) shows the exact downstream pressure
value regardless of the adjusted knob pressure setting. For special
conditions, e.g. in the presence of a downstream water heater, the
pressure may rise above the set value.
Outdoor Protective cover
Each 535H PRV comes with a snap-on protective cover which is
designed to resist UV rays, for outdoor locations, and to provide a
significant level of protection against dust, dirt and water. It does
not protect against freezing; do not mount the valve in locations
where it may freeze. Protective cover not approved for use in plenum
installations
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10
8
6
psi
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120
90
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0
60
20
40
80
100
0
1
2
5
6
7
3 4
psi
bar
Construction details
Pre-adjustment
Caleffi 535H series pressure reducing
valves have an operating knob and
a pressure setting indicator which is
visible on both sides. This pressure
indicator features incremental step
operation, where the pressure can be
adjusted continuously with the value
displayed at 15 psi increments.
The
pressure can be pre-set to the desired
value, even before the pressure
reducing valve is installed.
Adjustment lock
Tighten the screw in the top of the set
point knob to prevent tampering.
535 H S eri es
30
45
60
Pressure balanced seat
Caleffi 535H series pressure reducing
valves are designed with pressure
balanced seats. This means the
setting pressure value remains
constant, regardless of variations in the
upstream pressure value. In the figure,
the thrust towards the opening is
counterbalanced by the force created
by the closing pressure acting on the
compensating piston. Since the piston
has a surface area equal to that of
the shuttle, the two forces cancel out
each other.
The special cross-section of the flow
path between the seat and shuttle
seal stablizes upstream pressure
fluctuations and high flow rates,
reducing noise levels caused by the
flowing water.
bar
0
2
4
10
8
6
Low head losses
The large cross-section flow chamber
of the 535H series pressure reducing valve minimizes pressure drop
within the valve which results in superior falloff pressure, enabling more
flow capacity to fixtures.
bar
0
2
4
10
8
6