Page 53 - Industrial Ancillaries 2020 Catalogue (Sterling)

Instrumentation
FLOW DATA AT 20°C
Ori ce in fully open mode is 4.8 mm. Spring 10 - 225 psig
OPERATION
H-900 relief valves open when system pressure gets to the set pressure and close when system pressure drops below the set pressure. Warnings In Valves that were not actuated for some time may contain pressure higher than the set pressure. System designer and users shall determine what system applications require using relief valves to meet speci c safety codes and which valves conform to such codes.
SETTING AND RESEALING PRESSURE
• Upstream set pressure is the rst indicator of ow process. Every pressure relief after the rst indication is repeatable within a deviation of 5% at room temperature
• Blocked upstream set pressure is the rst indicator of a stopped ow process and is always lower than the set pressure
• Calculation of set pressure valve design demands back pressure consideration as the system back pressure increases the set pressure
To balance the system the back pressure must be multiplied by 0.8 and the result shall be subtracted from the required set pressure.
TESTING
The HAM-LET® H-900 Relief Valve designs have been tested for Proof and Burst. Every H-900 Relief Valve is factory tested for proper set and resealing preformance.
Spring Kits
Working Pressure Range:
50 psi up to 6000 psi (see table below)
• For H-900 HP Series relief valves • Includes spring and label
240
Part No.
Z-900-HP-SPK-1/4-A Z-900-HP-SPK-1/4-B Z-900-HP-SPK-1/4-C Z-900-HP-SPK-1/4-D Z-900-HP-SPK-1/4-E Z-900-HP-SPK-1/4-F Z-900-HP-SPK-1/4-G Z-900-HP-SPK-1/4-H
Pressure Range PSI
50-350 350 - 750 750 - 1500 1500 - 2250 2250 - 3000 3000 - 4000 4000 - 5000 5000 - 6000
Colour
Letter
Price
£11.35 £11.92 £11.92 £11.35 £11.35 £11.35 £11.35 £11.35
H-900 Series Relief Valves 01
White A Blue B Gold C
Turquoise D Green E Red F Silver G Black H
53