Function

Pressure Limiting Valves are different to pressure reducing valves - a pressure reducing valve is designed for use in applications which require far greater accuracy in controlling outlet pressure over a wide range of inlet pressures. Whereas a pressure limiting valve only controls the inlet supply line pressure to a pre-set maximum, and will remain in the open position if the pressure in the supply line falls below that pre-set maximum.

Pressure Limiting Valves

Operation

The PS and PSL are designed with a small back pressure area, and can tolerate a wide differential between its closing pressure and the opening pressure of a P&T valve. Consequently these valves are ideal for use with high pressure water heaters.

Application

Ideal for limiting pressure in pressure-sensitive pipelines, e.g., plastic and for other applications requiring pressure control above 350 kPa.

Main features

Individually tested and calibrated
Dezincification resistant
Sealed spring cavity (Dry Springs)
Automatic sealing
Non-resettable option available
Plastic coated temperature probe
Suitable for horizontal or vertical installations
Designed and manufactured in Australia

Installation

Storage Water Heater ...... Solar Water Heater

Main features

PS Model

Suits inlet pressure up to 1400 kPa.
Operates at up to 40°C
Suits hard water areas
Fixed outlet pressure settings (350, 500 & 600 kPa)

PSL Model

Suits inlet pressure up to 2000 kPa.
Operates at up to 80°C
Suits hard water areas
Has stainless steel seats
Improved flow rates
Fixed outlet pressure settings (350, 500 & 600 kPa)

Options

PS is available in three sizes, DN 15 (1/2"), 20 (3/4") and 25 (1") connections can be male, female or flared

PSL is only available in two sizes, DN 15 (1/2") and 20 (3/4") connections can be male, female or flared

Maintenance and trouble shooting

It should be noted that water borne sediment or dirt can, in certain circumstances, prevent the internal mechanism of the PS and PSL valves from functioning properly. It is recommended that in areas where the inlet pipes can cause water borne sediment, properly maintained. Strainers are used where necessary.

Specifications PS MODELS
Model
Size DN
Inlet / Outlet
Length
PS50C
15
(1/2") Male Compression
76mm
PS50
15
(1/2") 15F x 15F
72mm
PS75
20
(3/4") 20F x 20F
80mm
PS100
25
(1") 25F x 25F
103mm
Max Inlet Pressure 1400 kPa operates up to 40°C
Pressure settings available 350 kPa, 500 kPa and 600 kPa
Specifications PSL MODELS
Model
Size DN
Inlet / Outlet
Length
PSL50
15
(1/2") 15F x 15F
92mm
PSL50C
15
(1/2") Male Compression
92mm
PSL75
20
(3/4") 20F x 20F
92mm
PSL75C
20g
(3/4") Male Compression
92mm
Max Inlet Pressure 2000 kPa operates up to 80°C
Pressure settings available 350 kPa, 500 kPa and 600 kPa

Dimensions (mm)

PS50 Dimensions PS75 Dimensions PS100 Dimensions
PSL50 Dimensions PSL75 Dimensions

Flow Characteristics

Flow Graph PS50 & PSL50 Limiting Valves
Valve Setting 500kPa Mains Inlet 1000kPa Dynamic
PS Flow Chart

Available Models - PS
Model
Size
Description
Product Code
PS50C
15
(1/2") Male Compression
PS50C
PS50
15
(1/2") 15F x 15F
PS50
PS75
20
(3/4") 20F x 20F
PS75
PS100
25
(1") 25F x 25F
PS100
Available Models - PSL
Model
Size DN
Inlet / Outlet
Length
PSL50
15
(1/2") 15F x 15F
PSL50
PSL50C
15
(1/2") Male Compression
PSL50C
PSL75
20
(3/4") 20M x 20M
PSL75
PSL75C
20
(3/4") Male Compression
PSL75C

Approvals

Australia - Complies with AS1357.1
Hong Kong - WSD ref: (6) 10WWO3321/82xxxviii tj (25)
United Kingdom - WRC listed ref: 9406023