CALEFFI 5335 Series, 533545 AUS, 533555 AUS, 533550 AUS Installation, Commissioning And Servicing Instructions

Code 533550 AUS

3-way pressure reducing valve
Size 20 mm (3/4”)
Female connections (ISO 7/1)

Function

Pressure reducing valves are installed in residential water systems to reduce and stabilise inlet
pressure from the water mains supply which is generally too high and variable for domestic
appliances to function properly.
These valves can also be used to control inlet pressure to domestic hot
water storage. The Caleffi 5335 series have been specifically designed and
manufactured to meet the requirements of “AS1357.2:2005 Valves primarily
for use in warm and hot water systems - P. 2: Control valves”.

Inclined pressure reducing valves

Technical specifications

Materials:

Body: dezincification resistant alloy EN 12165 CW602N
Cover: PA6G30
Control spindle: dezincification resistant alloy EN 12164 CW724R
Cartridge: POM
Components: dezincification resistant alloy EN 12164 CW724R
Diaphragm: EPDM
Seals: NBR-EPDM
Strainer: stainless steel EN 10088-2 (AISI 304)
Plug (3 way model): PPAG40

Performance:

Pressure setting range: 100–600 kPa;
100–500 kPa (code 533550)
Factory setting: 500 kPa
Max. inlet pressure: 1600 kPa
Max. working temperature: 40°C
Medium: water

Complies with: AS 1357.2

Code 5335.. AUS

Pressure reducing valve
Sizes 15 mm (1/2”) and 20 mm (3/4”)
Female connections (ISO 7/1)

Product range

5335 series

AS 1357.2

C of C 02467

Installation, commissioning and servicing instructions

© Copyright 2018 Caleffi

38538.10

www.caleffi.com

2

Dimensions

A

15 mm

22 mm

Code

533545 AUS
533555 AUS

B

72,5

72,5

C

22,5

22,5

D

Ø 46

Ø 46

E

79

84,5

E

A

A

B

C

D

Mass (kg)

0,45

0,46

1

/2

5

3

3

5

S

e

r

ie

s

Pr

e

ssure ran

g

e

:

100÷6

0

0

k

P

a

Max

in

le

t

pr

e

ss

u

r

e

1

60

0

kPa

F

low

r

a

te

:

30

@

1

00

k

P

a

1

30

@

6

0

0

k

P

a

Ma

x

te

m

pe

ratu

re:

6

0

°C

0,5

1

2

5

0,2

∆p (kPa)

50

100

20

10

150

30

40

60

80

120

90

70

∆p (m w.g.)

5

10

2

1

15

3

4

6

8

12

9

7

5

10

20

50

Flow rate

(l/min) (m

3

/h)

1/2” 3/4”

A

3/4”

Code

533550 AUS

B

72,5C50DØ 46E82,5

E

A

A

B

C

D

0,49

5

3

35

S

er

ie

s

Pres

s

u

re ra

ng

e:

1

0

0

÷

6

0

0

k

Pa

M

a

x

in

le

t

p

r

e

ss

u

r

e

1

6

00

k

Pa

F

lo

w

rate: 30

@

100

kPa

130 @

600

k

P

a

M

a

x

t

e

m

p

e

ra

t

ur

e

:

6

0

°C

A

S

13

57.2

W

M

K

A

0

2

4

6

7

AS

1

3

57

.

2

W

MK

A

0

2

46

7

Mass (kg)

Pressure drop diagram

Under following conditions:
Inlet pressure 600 kPa
Outlet set pressure: 400 kPa

Installation

The pressure reducing valve must be installed by a licensed plumber and in accordance with AS/
NZS 3500, relevant local requirements and following these instructions.
The installer must:

- ensure the reducing valve is compatible with any other equipment in the system it may interact
with or come into contact with logistically;

- assess and acknowledge all hazards related to the use of the product, including leaks, by
installing the unit properly;

- install shut-off valves fitted with pressure ports or similar equipment to measure the upstream
pressure.

MAINS

SUPPLY

1/2

5335 S

e
ri

es

Pr
e
s

sure

r
a
nge:

10
0

÷

60

0
k

P
a

Max

inle

t
p
r
e
ss

ur

e

16
00 kPa

F
l
o

w
r

a
t
e: 3

0 @
1

0
0 kPa

130 @ 6

0
0

k
Pa

Max

t
emp

e
ratu

r
e

: 6

0°C

Check

valve

Pressure reducing valve Line strainer

(where fitted)

Isolating

valve

Installation diagram

A
S 1

3
57

.2
W
MK

A

0
2467

3

System without recirculation

COLD

WATER

INLET

STORAGE HOT

WATER HEATER

Tempering

valve

1/2

5335 Series

Pressure range:

100÷600 kPa

M
ax inlet pressure

1600 kPa

Flow rate:

30 @ 100 kPa

130 @ 600 kPa

M
ax tem

perature:

60°C

MAINS

SUPPLY

1/2

5335 Series

Pressure range:

100÷600 kPa

Max inlet pressure

1600 kPa

Flow rate:

30 @ 100 kPa

130 @ 600 kPa

Max temperature:

60°C

Check

valve

Pressure reducing valve Line strainer

(where fitted)

Isolating

valve

Installation diagram

5335 Series

Pressure range:

100÷600 kPa

Max inlet pressure

1600 kPa

Flow rate:

30 @ 100 kPa
130 @ 600 kPa

Max temperature:

60°C

5335 Series

Pressure range:

100÷600 kPa

Max inlet pressure

1600 kPa

Flow rate:

30 @ 100 kPa
130 @ 600 kPa

Max temperature:

60°C

Straight
outlet

Angle
outlet

Inlet Outlet

Plug

Inlet

Outlet

Plug

MAINS

SUPPLY

Check

valve

Pressure reducing valve

Line strainer

(where fitted)

Isolating

valve

5
3
3
5

S
e
r
ie

s

P
r
e

s
s
u
r

e
ra
n
g

e
:

1
0
0

÷

6

0

0

k
P

a

M
a
x

in
le

t p
r
e
s

s
u
r
e

1
6

0

0

k

P
a

F

lo
w
ra

te

:

3
0

@
1

0

0

k

P
a

1

3
0
@

6
0

0

k

P

a

M
a

x
te
m

p
e

ra
tu
r
e

:

6

0

°

C

AS 1357.

2

WMKA 02467

AS 1357.2
WMKA 02467

A
S
1

3
5
7

.2
W
M

K
A
0

2

4

6

7

A

S
1

3
5
7

.2
W
M

K
A
0

2
46

7

AS 1357.2
WMKA 02467

4

Recommendation for installation conditions

When installed upstream of a hot water tank, we recommend installing an expansion vessel or similar
equipment to absorb the increase in pressure due to the thermal expansion of the water.
When installed in large buildings, adopt technical measures such as using short pipes or including
expansion valves and similar equipment to limit the increased pressure due to the thermal expansion
of the water caused by temperature changes downstream of the reducing valve itself (or downstream
of the first and second stage reducing valves, if two are present).

Downstream set pressure (kPa)

2000

1600

1200

800

400

Cavitation

high risk

Normal working

conditions

Out of working

conditions

Upstream pressure (kPa)

100

200

400

600

800

1000

1200

Cavitation diagram

To minimize the risk of cavitation within the valve that may result in malfunctioning with erosion of
valve sealing area, vibrations and noise, it is highly recommended to refer to the working conditions
represented in the above diagram.
Due to the numerous factors and variable conditions experienced such as system pressure, water
temperature, air presence, flow rate and velocity, which may affect the behavior of the pressure
reducing valve, it is advisable that the pressure ratio between the upstream pressure and the
downstream set pressure is kept ideally to a value 2:1 and no greater than a value of 3:1. (For
example, upstream 1000 kPa, set pressure 500 kPa, the pressure ratio = 1000/500 = 2:1). In these
conditions, the possible risk of cavitation and malfunctioning is minimised, however this does not
exclude the possible effects of the many other variables within the system under operating conditions.
If the pressure ratio exceeds the indicated limit, the system design pressure or use of 1st stage
pressure reducing valves shall be reviewed. (For example, 1st stage reducing pressure from 1600 to
800 kPa and then 2nd stage from 800 to 400 kPa).

1° stage

PRV

2° stage

PRV

possible

expansion

possible

expansion

5

Pipework upstream and downstream of the pressure reducing valve shall be supported in accordance
with the manufacturer’s instructions, AS/NZS 3500 along with any other local authority requirements,
to avoid the creation and transfer of vibration and/or noise into the installation.
The inlet strainer of the pressure reducing valve shall be periodically checked and cleaned, to minimize
any partial or complete blockage which may limit the flow rate from the valve and/or create noise.

System flushing, cleaning and disinfection of the pipework to which the valve is installed shall be
performed by suitably qualified persons in accordance with the system component manufacturer’s
instructions, AS/NZS 3500 along with any other applicable local authority requirements. Exceeding
the maximum stated chemical concentrations and/or duration of exposure may negatively
impact on the performance of the system and/or components installed such as the pressure
reducing valve. Chemical dosed products must be chemically compatible with materials used for
the construction of the pressure reducing valve, specified in its technical documentation.

Installation below ground

If installing the 5335 series valve underground, please ensure that steps are taken to protect the
valve from becoming frozen in frost-prone areas.
Please allow yourself sufficient space to remove the cartridge should maintenance be required.
The reading of a gauge for setting purposes may be difficult and an alternate means of checking
downstream pressure may ne necessary.

Water hammering

This is one of the main problems which may affect pressure reducing valves. It is best to fit
special devices to absorb water hammering when fitting pressure reducing valves in systems at risk.

WARNING:

If it is critical to maintain the downstream pressure setting to protect equipment, as
a safety measure, we recommend that a pressure, or safety, relief valve is installed
downstream of the pressure reducing valve.

Setting

1. Flush the system.

2. Install the pressure reducing valve in any position either vertically or
horizontally, not upside down, paying attention to the “direction of flow”
indicator on the body of the valve.

3. Caleffi 5335 series pressure reducing valves are factory set at 500 kPa.

4. If required, reset the pressure by turning the screw on the top of
the plastic cover. Turn it clockwise to increase the pressure and
anticlockwise to decrease it.

Maintenance

The reducing valve must be checked and serviced in compliance with applicable regulations. Even
when installed, commissioned and serviced properly, the reducing valve’s internal components are
subject to normal wear and tear, which may result in leaks and other malfunctions. We advise that you
check that it is in good working order and service and clean the cartridge at least every 12 months.
Proceed as follows for periodic cleaning of the strainer and inspection of the cartridge:
1 Turn off upstream water supply to the pressure reducing valve and open an outlet downstream
to relief pressure

CALEFFI

S.R. 229, n. 25 · 28010 Fontaneto d’Agogna (NO) · Italy · Tel. Int. [phone] R.A. · Fax [phone]

Http://www.caleffi.com · E-mail:[e-mail]

AUSTRALIAN AGENT

All Valve Industries

Unit 2, 18-28 Sir Joseph Banks Drive

Kurnell NSW 2231
Ph: [phone]

Fax: [phone]

Email: [e-mail]

Safety

If the pressure reducing valve is not installed, commissioned and maintained properly in
accordance with the instructions contained in this manual, it may not operate correctly,
and may cause damage to objects and/or persons.
Make sure that all the connections are water-tight.

When installing the pressure reducing valve, make sure not to over-tighten the connections to the
valve as, over time, a failure can occur with subsequent water leakage causing damage.
In the case of highly aggressive water, arrangements must be made to treat the water before it enters
the pressure reducing valve, in accordance with current legislation. Otherwise, the pressure reducing
valve may be damaged and not function correctly.

Leave this operating manual with the user

2 Unscrew (anticlockwise) the setting screw to decompress the spring inside.
3 Unscrew the cover.
4 Extract the cartridge with the aid of pincers to grip the head of the screw.

5 After inspection and cleaning, refit the cartridge or, alternatively, fit a replacement cartridge.
6 Reset the valve (see Installation).

Trouble-shooting

1. Increased downstream pressure near a water heater

This problem is due to the water being heated by the water heater. There is no relief of the pressure
because the

reducing valve is correctly closed.

The solution is to install an expansion

vessel (between the heater and the reducer) to

“absorb” the pressure increase.

2. The pressure reducing valve does not maintain its set pressure

In most cases this is the result of impurities that deposit on the valve seat causing leakage
with a resulting increase in pressure downstream. The solution is to fit a filter upstream from
the reducer and subsequently to maintain and clean the cartridge (see Maintenance).

2 3

4