Heavy Duty Balanced Opposed Compressors - Ariel Corporation

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FOR MODELS: JGZ AND JGU SECTION 4 LUBRICATION Outlet 3 Outlet 4 Inle t Section Section No. 1 Section No. 2 Section No. 3 End Section Inle t Section Section No. 1 Section No. 2 Section No. 3 End Section Inlet Section Section No. 1 Section No. 2 Section No. 3 End Section O-Ring O-Ring O-Ring FIGURE 4-4: DIVIDER VALVE OPERATION SCHEMATIC - 7 THROUGH 12 7/09 PAGE 4 - 35 Inle t Section End Section Illustration 7 Illustration 8 Section No. 1 Section No. 2 Section No. 3 Inle t Section Section No. 1 Section No. 2 Section No. 3 End Section Illustration 9 Illustration 10 Illustration 11 Outlet 5 Outlet 4 Inle t Section Section No. 1 Section No. 2 Section No. 3 End Section Illustration 12 O-Ring O-Ring O-Ring Outlet 5 Outlet 6
FOR MODELS: JGZ AND JGU SECTION 4 LUBRICATION Pressure Testing For Divider Valve By-Passing Divider valve piston to bore are metal to metal sealing surfaces. Lubricant by-passing can result from excessive clearance between the piston and bore due to wear. Pressure test all divider blocks that are in service yearly, and replace any divider valves that fail to pass. Testing helps to ensure the piston to bore clearances are close enough to build adequate pressure to force oil into the injection point. All new <strong>Ariel</strong> divider valves are provided pressure tested by the supplier. To test divider blocks for valve by-passing, a manual purge pump equipped with a pressure gauge, and capable of developing 5000 psig (350 bar g ) is necessary. Such a force feed lubrication system purge gun (hand pump kit) with a pressure gauge is available from <strong>Ariel</strong> as an optional purchase tool. For pressure testing the divider block use a 10-weight oil at room temperature to simulate a hot lubricant. Test each divider block assembly complete with pin indicators installed. Test only one divider valve at a time. Place the divider block assembly in an open container with all base outlets open. Connect the purge pump to the inlet of the divider block assembly. Operate the purge pump to cycle the divider block several times to purge air from the assembly and verify that oil will flow freely from all outlets. Divider blocks should cycle at less than 300 psig (21 bar g ). See Figure 4-5: “Divider Block All Outlets Open”. Divider valves stamped with a “T” are to have only one outlet on the base plugged during testing of that side of the piston. Each base outlet of the divider valves stamped with a “T” must be plugged and tested one side at a time. See Figure 4-5: “Testing “T” Divider Valve”. Individual testing of each outlet ensures both sides of the piston will build adequate pressure. All divider valves stamped with an “S” on the front are to have both outlets on the base plugged to test for by-passing. See Figure 4-5: “Testing “S” Divider Valve”. This will test both sides of the piston at the same time. Plug the outlet on the base behind the divider valve being tested with a 1/8 inch pipe plug. If a tubing fitting is installed in the base, plug the fitting with a tubing plug. Leave all other outlets open. Operate the purge gun until the pressure gauge indicates 3000 psig (207 bar g ). The block may cycle once or twice, but should pressurize to 3500 psig (241 bar g ) immediately. Stop pumping oil into the divider block at 3500 psig (241 bar g ). Check the plug(s) in the discharge outlet(s) to confirm there are no external leaks. If the pressure gauge on the purge gun drops suddenly and oil squirts from the other outlets, a by-pass condition exists. The piston is worn and is allowing oil to by-pass. The pressure gauge should not lose more than 1000 psig (69 bar g ) during a 30-second test period. Note: Testing the divider blocks at higher pressures is necessary if the application dictates a higher system operating pressure. If a divider valve does not pass, it must be replaced. Discard worn divider valves. If the tested valve does not lose more than 1000 psig (69 bar g ) in 30 seconds, relieve the pressure, move the plug to the next outlet and repeat the test for all divider valves. When divider valves have passed pressure testing to this procedure or have been replaced, a divider block may be reassembled, purged with the proper force feed lubricant being used and put into service. By the nature of this divider block pressure testing procedure, in a static position through the divider valves above, it is not infallible. Periodic testing for proper lubrication rates in the cylinder bore and/or aftermarket devices that measure flow are recommended. PAGE 4 - 36 7/09
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Heavy Duty Balanced Opposed Compressors - Ariel Corporation

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