User manual FLUKE MPG2-H-HV

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Manual abstract: user guide FLUKE MPG2-H-HV

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[. . . ] MPG2-HTM and MPG2-H-HVTM Manual Pressure Generator/Controller for Hydraulic Pressure Operation and Maintenance Manual © 2004-2008 DH Instruments, a Fluke Company High pressure liquids and gases are potentially hazardous. Energy stored in these liquids and gases can be released unexpectedly and with extreme force. High pressure systems should be assembled and operated only by personnel who have been instructed in proper safety practices. © 2008 DH Instruments, a Fluke Company All rights reserved. Information in this document is subject to change without notice. No part of this document may be reproduced or transmitted in any form or by any means, electronic or mechanical, for any purpose, without the express written permission of DH Instruments, a Fluke Company, 4765 East Beautiful Lane Phoenix AZ 85044-5318 USA. [. . . ] The reservoir shut valve isolates the reservoir from the pressurized circuit. It is opened use the priming pump, to fill the variable volume with fluid and to open the pressurized circuit to atmosphere (vent). The test shutoff valve isolates the TEST1 and TEST2 ports from the rest of the MPG2 circuit. It can be used to isolate the variable volume and reservoir from the pressurized test system, for example, if it becomes necessary to refill the variable volume with fluid when it reaches end of stroke. As test shutoff the valve needle displaces fluid when it is operated, it can also be used as a very fine variable volume for very fine pressure adjustment. 3. 1. 3 PRIMING PUMP The priming pump is a syringe style fluid injector, built into the reservoir cover. On its plunger upstroke, it draws oil from the reservoir into its barrel. On the down stoke, the barrel tip seals with the connection on the bottom of the reservoir and the plunger pushes oil into the rest of MPG2 and out the test port. The priming pump is used to fill the MPG2 and system to which it is connected with hydraulic fluid and then generate a low, starting pressure. 3. 1. 4 VARIABLE VOLUME (VV) The variable volume (VV) is a piston-cylinder type screw press. Rotating the variable volume handles, moves the piston in or out decreasing or increasing the volume and therefore increasing or decreasing pressure. The VV is used to generate and adjust pressure in the system to which MPG2 is connected when the reservoir shut valve is closed and test shut off valve is open. The torque necessary to rotate the VV handle is proportional to the pressure in the variable volume. Generally, the starting position of the VV when beginning to generate pressure from atmosphere is with the piston fully retracted (handles rotated maximum CCW) so that the full stroke of the VV is available to fill the test system and generate pressure. Page 9 © 2004-2008 DH Instruments, a Fluke Company MPG2-H OPERATION AND MAINTENANCE MANUAL During operation, if the VV runs out of stroke, the test shut off and reservoir shutoff valves can be used in sequence to allow the variable volume to be refilled without releasing the pressure on the TEST1 and TEST2 port (see Section 3. 2. 3). The maximum operating pressure of the variable volume is 200 MPa (30 000 psi) with MPG2-H and 100 MPa (15 000 psi) with MPG-H-HV and. Do not generate pressure greater than the maximum operating pressure. 3. 1. 5 RESERVOIR 3 The reservoir is a 300 cc (18 in ) aluminum vessel mounted inside the MPG2 housing. It is accessed for filling or cleaning by a screw on cover on the top surface of the MPG2 housing. The reservoir is connected to the RESERVOIR ISOLATION valve by flexible tubing. The reservoir lid can used to force fluid out of the reservoir into the system connected to the OPG1. 3. 2 OPERATION Operation of the MPG2 can be divided into three common tasks: filling and priming the system under test (See Section 3. 2. 1); generating and adjusting pressure (see Section 3. 2. 2); filling or emptying the variable volume while maintaining test system pressure (see Section 3. 2. 3). 3. 2. 1 FILLING AND PRIMING THE SYSTEM UNDER TEST, PRIMING PUMP It is important to remove air from the test system by filling and priming it before using the variable volume to generate pressure. Failure to fill and prime will result in the need to use multiple variable volume strokes to generate pressure. The reservoir pump is designed to push oil through the MPG2 and out the TEST port into the test system. It can also generate an initial pressure, saving variable volume stroke. To fill and prime the test system, prior to generating pressure with the variable volume, proceed as follows: Leave an open purge point (for example a loose fitting) at the highest point possible in the system that is connected to the MPG2. Open the reservoir shut off valve and the test shut off valve to connect the reservoir to the rest of the system. [. . . ] Slowly open the TEST ISOLATION valve to equalize the pressure. Proceed to generate and adjust pressure as desired (see Section 3. 2. 2). © 2004-2008 DH Instruments, a Fluke Company Page 12 4. MAINTENANCE AND ADJUSTMENTS 4. MAINTENANCE AND ADJUSTMENTS MPG2 was designed for maintenance free operation. The only recommended regular maintenance is to flush the hydraulic system and replace the operating liquid. 4. 1 REPLACING LIQUID AND FLUSHING HYDRAULIC SYSTEM Regular replacement of MPG2's operating liquid and flushing of the hydraulic system is recommended. [. . . ]

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