This information is reproduced with the kind permission of Refrigerating
Specialties. Their own website is located at www.parker.com/refspec
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Q)
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Are your products compatible with the new alternative
refrigerants?
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A)
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Yes, the R/S valves are compatible with most common HFC refrigerants
and refrigerant oils.
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Q)
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Is there a problem with selecting valves according to
the line size?
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A)
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Control valves should be selected according to load requirements
and operating conditions. In most cases the control valve
will be smaller than the line size. Service valves and hand
valves are generally selected according to line size.
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Q)
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Why does my control valve hunt (chatter)?
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A)
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The frequent cause for hunting is the valve being oversized
for the operating conditions. This often is the result of
selecting a control valve by line size rather than operating
conditions.
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Q)
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What is MOPD?
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A)
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Maximum Operating Pressure Difference. A valve will not open
when its rated MOPD is exceeded.
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Q)
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Will refrigerant flow backwards through a solenoid valve
or regulator?
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A)
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Yes. If the down stream pressure exceeds the upstream by
the amount of the closing spring pressure, you will get reverse
flow through the valve. Check valves installed down stream
of the control valve will prevent this from happening.
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Q)
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Can control valves be installed in a vertical line?
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A)
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R/S recommends that all regulators and solenoids be installed
perpendicular to a horizontal line (please consult us for
exceptions).
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Q)
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Is it necessary to disassemble your hand valves before
welding them in line?
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A)
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With larger valves and proper precautions disassembly in
not required. However, R/S recommends disassembly to avoid
seat damage.
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Q)
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What is MRP?
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A)
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It is the maximum rated pressure of the valve.
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Q)
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How are valves affected by PED97/23/EC?
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A)
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The Pressure Equipment Directive affects valves in different
ways. Final implimentation of the Directive took place on
29th May 2002. The majority of larger regulating valves were
affected. On request we can provide PED compliance information
for all the valves that we supply.
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