User manual FLUKE GPC1-10000-AF

[. . . ] Operation and Maintenance Manual NSN 6685-01-529-6990 RN (1 of 3) GPC1-10000-AFTM Gas Pressure Controller © 2007 DH Instruments, a Fluke Company GPC1-10000-AFTM OPERATION AND MAINTENANCE MANUAL This equipment described in this manual is designed and manufactured for the intended purpose of generating high pressure gas. Certain precautions need to be followed during installation and operation of this device. Reading and understanding this material is essential to the safe and correct operation of the unit. Pressurized equipment is potentially dangerous. The equipment described in this manual generates and controls very high gas pressures. [. . . ] If it is necessary to use alternate materials, use caution and ensure that: a) the front panel controls and indicators are protected; and, b) the tubing and components exposed through GPC1's open bottom are protected. GPC1 must ride on its four (4) feet - NOT on its internal components. © 2007 DH Instruments, a Fluke Company Page 18 3. OPERATION 3. 3. 1 OPERATION OPERATING PRINCIPLE Numerical references in this section refer to Section 3. 1, Figure 88. GPC1 is a self-contained system designed to set and adjust gas pressure in static pressure test and calibration systems. GPC1-10000-AF operates to 10 000 psi (70 MPa). GPC1 combines the capability to execute large pressure changes very quickly with very fine pressure adjustment. GPC1 uses two different techniques to set and adjust pressure. These are rough pressure control using the TEST INLET and TEST OUTLET valves (12, 15) and fine pressure control using the PDVV (+) and (-) valves (13, 14). The first means of setting and adjusting pressure uses the external gas pressure supply (1) with the TEST INLET SET regulator (5), TEST INLET valve (12) and TEST OUTLET valve (15). This combination is used for filling the system under test, making large pressure changes and for rough pressure control. The valves are Belleville spring loaded, half-turn needle valves. Their operation is highly progressive over a half-turn with mechanical stops at each end so they cannot be over tightened. The regulator is self venting and its output is indicated by the TEST INLET gauge (4). The valve is turned clockwise (CW) to close and counter-clockwise (CCW) to open. A WHITE dot on the handle body indicates the valve's current open/close position. The TEST INLET SET regulator (5) and TEST INLET gauge (4) are used to set the supply pressure to the TEST INLET valve (12). Opening the INLET valve (12) allows the supply pressure to enter GPC1 and reach the TEST ports (6, 7, 8). Opening the OUTLET valve (15) exhausts gas, reducing pressure in the system. The second means of generating and adjusting pressure is the Pneumatically Driven Variable Volume (PDVV) (16) combined with the PDVV (+) and (-) valves (13, 14). This combination is used for smaller pressure changes and fine pressure control. The PDVV is a pneumatically actuated variable volume. A piston or plunger in a cylinder is exposed to the high pressure gas to be adjusted. [. . . ] The device that is connected to GPC1 to be tested or calibrated. The "jam nut" in a DH500 fitting that pushes the collar on the tube into the seat. A pneumatically actuated plunger in a cylinder used to increase and decrease the volume of the high pressure gas test system and provide fine adjustment of the test pressure. Momentary, push button actuated, poppet valves that admit drive air drive pressure to the PDVV actuator causing the PDVV plunger to move forward, compressing the high pressure gas and increasing the test pressure. [. . . ]