SECTION 6
LOW PRESSURE WATER
Feb 2001
p. 6-2
05132535
inlet temperature is required to maintain oil temperature under extreme
operating conditions.
Cooling water flow rate is regulated by the water modulating valve (19).
A thermal bulb (20) mounted in the hydraulic reservoir varies cooling
water flow rate relative to hydraulic oil temperature. Higher oil
temperatures tend to cause the water modulating valve to open, allowing
more cooling water to flow to the heat exchanger (6). See Section 10
“Recirculation” for operating instructions concerning the water
modulating valve.
6.2 Cutting Water Supply
The cutting water supply includes the following:
• Low pressure water filter
• Quick disconnect couplings at the intensifier inlet ports
The low pressure water fittings are stainless steel or brass with rubber
hoses connecting the low pressure water components.
The low pressure water circuit is equipped with a pressure gage to
indicate inlet water conditions to the intensifier.
Quick disconnects are provided at each of the HP cylinder inlet check
valve/sealing head ports for ease of maintenance, preventing low
pressure water from spraying out when this connection is broken.
6.2.1 Normal Operating Condition
During normal operation, the low pressure water system maintains the
following conditions:
• Pressure gage reads 2 bar (30 psig) or greater while intensifier is
pumping at maximum flow rate.
• Components feel cool to touch, indicating no HP water leaks into
cutting water supply.
6.2.2 Operation
The cutting water enters the SL-IV Pump through a bulkhead fitting.
NOTE
Inlet pressure is affected by filter condition, as well as local water
supply conditions.
The water flows through the low pressure water supply filter (18), then
through quick disconnect fittings (not shown) to each of the two inlet
check valves on the intensifier assembly (30). Note that a pressure gage
(29) provides indication of cutting water supply conditions. Gage reading
should exceed 2 bar (30 psig) to assure proper intensifier operation. A
relief valve (31) in prevents excessive pressure in the cutting water
supply caused by a leaking HP inlet check valve. Possible check valve(s)
located away from the SL-IV Pump would otherwise trap water being
leaked from HP check valves.
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