Operation with water flow
When a faucet is opened in the water system, the force of the spring
becomes greater than that of the diaphragm; the shuttle moves
downwards opening the valve to the flow of water. The greater the
demand for water the lower the pressure under the diaphragm with a
resulting greater flow of water through the valve
.
Operation without water flow
When the faucet is closed, the downstream pressure rises and pushes
the diaphragm upwards. As a result the shuttle closes the valve to the
flow of water and maintains the pressure at the pressure setting. The
slight difference between the force of the diaphragm compared to that
of the spring causes the valve to remain closed.
UPSTREAM
DOWNSTREAM
psi
0
30
60
150
120
90
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20
40
80
100
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1
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4
psi
bar
psi
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120
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20
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80
100
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100
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40
80
100
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psi
bar
psi
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0
60
20
40
80
100
0
1
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5
6
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3
4
psi
bar
UPSTREAM
DOWNSTREAM
psi
0
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150
120
90
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60
20
40
80
100
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4
psi
bar
psi
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120
90
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20
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100
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20
40
80
100
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4
psi
bar
psi
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30
60
150
120
90
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0
60
20
40
80
100
0
1
2
5
6
7
3
4
psi
bar
UPSTREAM
DOWNSTREAM
psi
0
30
60
150
120
90
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0
60
20
40
80
100
0
1
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5
6
7
3
4
psi
bar
psi
0
30
60
150
120
90
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bar
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100
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bar
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0
60
20
40
80
100
0
1
2
5
6
7
3
4
psi
bar
psi
0
30
60
150
120
90
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0
60
20
40
80
100
0
1
2
5
6
7
3
4
psi
bar
Operating principle
Operation of the pressure reducing valve is based on the balance
between two opposing forces:
1. The force of the spring towards the opening of the valve.
2. The force of the diaphragm towards the closure of the valve.
Construction details
Contoured diaphragm
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.
Non-stick materials
The central support assembly
(1), 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 (2)
minimizes the harmful affects
associated with the use of hard
and aggressive water.
Removable cartridge
The cartridge containing the
diaphragm, filter, seat and valve
plug, 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
pressure setting, which may be left
unchanged.
Compact dimensions
The “inclined” configuration makes
the PresCal
Compact
533H series
pressure reducing valves compact
for easy installation.
.
psi
150
psi
0
30
60
150
120
90
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0
60
20
40
80
100
0
1
2
5
6
7
3
4
psi
bar
REMOVABLE
CARTRIDGE
REMOVABLE
STRAINER
➟
REMOVABLE
FILTER
(1)
(2)
REMOVABLE
CARTRIDGE
