Sumitomo SRDK Series - Page 54

OPERATION MANUAL Sumitomo Heavy Industries, Ltd.
SRDK Series CRYOCOOLER 25
2-7 CONNECTING FLEX LINES
FUNDAMENTAL
The Cold Head can be operated with a rotary valve to control the gas inlet / outlet timing of the
refrigeration cycle. The pressure difference between the supply and the return can be available to get
the seal between the rotary valve and the valve plate (as shown in the Figure). The return pressure
must be less than supply pressure in connecting the Flex Line. To avoid the malfunction of the Cold
Head, careful handling must be taken in connecting Flex Line.
In case the Cold Head will be operated with miss-connected flex lines, for example “Supply line” to
“Return connector” and “Return line” to “Supply connector”, the Rotary Valve will be pushed back by the
Supply pressure and the Cold Head will malfunction with no intake/exhaust noise.
CONNECTING PROCEDURE
1） Remove all protective caps of the supply and return Flex Lines, Cold Head and Compressor Unit.
2） Check all the flat rubber gaskets of self-sealing connectors to make sure of being clean and properly
positioned.
Valve Plate
Bearing
Rotary Valve
Supply (Ps)
Return (Pr)
Supply (Ps)
Return (Pr)
To Displacer
NORMAL CONDITION ( Ps > Pr )
ABNORMAL CONDITION ( Ps = Pr )