NOTE: Never re-locate the suction or discharge check valves away from the chemical head. To operate
properly, check valves must remain directly attached to the chemical head. If desired, a secondary
discharge line check may be placed downstream of the pump discharge.
1.2.3 Connect your discharge line to the pump discharge. This is normally a 3/8 autoclave or 1/2” SS compression
tubing connection (see illustrations in the Parts List Manual).
1.2.4 Check that the packing nut is properly adjusted. In a new pump, proper adjustment is finger-tight, plus 1/8
of a turn. Use a packing adjustment tool (available from CheckPoint at no charge) for best results. IMPORTANT:
PLEASE REVIEW Section 4.1: Packing Adjustment on page 10.
NOTE: DO NOT OVER-TIGHTEN THE PACKING NUT. Applying excess torque to the packing nut will decrease
the life of the packing.
1.2.5 Open the process block valve, allowing the process pressure to reach the chemical head. Correct any leakage
observed.
CAUTION: The Series 5400/8400 chemical head is rated for a maximum working pressure of 10,000 -
20,000 psig. If the discharge line is inadvertantly blocked, certain combinations of air/gas
supply pressure and plunger size can generate pressures in excess of 20,000 psig. A relief valve
must therefore be placed between the discharge check and the process flow to prevent this
condition. To predict the maximum pressure that can be developed by your pump, use the
formula: [supply air pressure] x [amplification ratio] = [discharge pressure]. To find the
amplification ratio for your pump, please see Figures 2 & 3 on page 7.
NOTE: Always open the process block valve (shown as number 7 in Fig 1) prior to operating the pump.
Operating the pump with a closed block valve can generate enough pressure to rupture the
discharge line, permanently damage the block valve, or reduce the useful life of the pump.
1.3 Connecting The Supply Gas
1.3.1 Gas supply to the pump should be clean compressed air or natural gas at 50 psig minimum, 200 PSIG
maximum. “Clean” means free of abrasive dust, sand or other grit that could abrade the seals inside the pump. The
pump does not require a pressure regulator when operated within these recommended supply pressures, as long
as the supply pressure remains relatively constant ( 5%).
NOTE: It is not necessary to remove most liquids, such as distillate carryovers, from the supply gas. The
pump will not stall no matter how much liquid reaches the air/gas inlet. Certain chemicals can attack
seals in the motor, however, so make certain that the supply gas has been specified as part of the
ordering process so that CheckPoint can supply the correct seals for your application.
CAUTION: Always use a gas pressure regulator if the possibility of supply pressures in excess of 200 psig
exists. Allowing higher gas pressures to enter through the air/gas inlet will most probably
result in damage to the motor seals. Also, such pressures will translate into excessive discharge
pressures, which can rupture chemical discharge tubing.
1.3.2 Liquids may also be used as a driver fluid, but pump speed will vary widely with the liquid viscosity. Call
CheckPoint for performance data for the liquid you intend to use.
1.3.3 Blow the supply gas line clean to remove all foreign matter and debris.
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