Calorex ROMA Installation, Operation & Maintenance Instructions

INSTALLATION, OPERATION & MAINTENANCE INSTRUCTIONS
'ROMA' FIG 119 RATIO PRESSURE REDUCING VALVES
APPLICATION
The valves are fitted wherever system pressure requires reducing.
Suitable for liquids and gases.
Recommended for applications where the inlet pressure is constant, or the final downstream pressure is not
critical.
DESCRIPTION
The Fig. 119 Ratio Pressure Reducing Valve is direct acting, single seated, piston balanced and piston
regulated.
OPERATION
The upstream pressure (P1) is introduced below the valve disc, which is opposed by atmospheric pressure
via a vent port above the balancing piston.
The downstream pressure (P2) is introduced above the control piston, which is sized to a fixed ratio of the
area of the valve disc, and also opposed to atmospheric pressure via the vent port.
The valve will then modulate the flow to maintain a fixed relationship (eg 2:1) between P1 and P2, governed
by the ratio of the respective areas of the valve disc orifice and the control piston.
INSTALLATION
The valve is self contained and requires no external connections.
• The pipeline should be flushed prior to installation - foreign particles are a common cause of
initial problems with control valves.
• Ensure that the direction of flow is correct according to the arrow on the valve body.
• Preference should be given to mounting in a horizontal pipeline.
• It is recommended that the valve be protected with a fine mesh strainer.
• Isolating valves, relief valve and pressure gauges should be installed for proper
maintenance, protection and operation.
COMMISSIONING
• Admit upstream pressure gradually, allowing pressures to stabilize.
• Gently crack open ball valve on piston chamber at top of valve to release any trapped air.
MAINTENANCE
Most maintenance can be performed without removing the valve from the pipeline.
Before carrying out any maintenance, isolate the valve and release any pressure in the line.
Calorex Australia Pty Ltd
ABN 38 119 660 874
17 Milgate Street
Oakleigh South Victoria 3167
P: +61(0)3.9544 4546
F: +61(0)3.9544 4255
E: info@calorex.com.au
www.calorex.com.au
1/3