Ashcroft 1305DMH-20 Посібник з монтажу та обслуговування - Сторінка 10

Переглянути онлайн або завантажити pdf Посібник з монтажу та обслуговування для Випробувальне обладнання Ashcroft 1305DMH-20. Ashcroft 1305DMH-20 20 сторінок. Deadweight tester and portable pump

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To replace the tester in its case, remove the gauge offset

pipe assembly (64 or 66) and the piston and cylinder

assembly (67 or 79). Install shipping plugs in body outlet

holes. Screw in the displacement valve (41) until it stops.

Close the vent plug (35). Open the release valve (37) ap-

proximately _ turn. Replace the tester in its case, reservoir

last. Engage the spring clip catch.

3.3.7 General Precautions

It is important that the deadweight tester be connected to

a leak tight system.

The deadweight tester should be set-up so that the axis

of the located piston is vertical, the weights carefully cen-

tered on that axis, and the piston rotated during use. The

purpose of the rotation is to spread the lubricant over the

entire surface between piston and cylinder, so that there

will be no metal-to-metal contact. If rotation is not main-

tained, the lubricant film will not cover the surface properly,

and readings will be in error.

The high and low pressure piston assemblies have an

internal overload stop, which prevents the piston and cyl-

inder from being forced apart if weights are accidentally

removed.

3.3.8 Operating Fluids

Standard Tester:

Any medium weight oil may be used (including automotive

oils S.A.E. 10, 20 or 30) S.A.E. 20-W recommended.

Hydraulic Tester:

Any hydraulic fluid (silicate or phosphate base). Skydrol or

Pydraul is suitable.

For normal operation, it is not necessary to change the

weight of oil for various pressures. A lighter oil may be

used where low pressures are being checked, and a

heavier oil where higher pressures are being tested.

The reservoir can be refilled while the tester is operating

under pressure.

3.3.9 Caution

Standard testers designed for oil service may not be used

with water for oxygen service.

3.3.10

Hydraulic service testers should not be filled with water or

any oil other than hydraulic fluid. Serious pump failure may

occur due to O-ring damage.

3.4. Installation Type 1327

3.4.1 Set up Procedure (See Figures 2-2)

To remove the test pump from the case, release the spring

clip, depressing the clip by hand, grasp the pump reser-

voir, and lift up the back end of the pump assembly.

Remove the two plastic shipping plugs from the outlet

connections. Remove the threaded filler plug (35) from

reservoir filling hole. Remove the offset pipe (64) or (66)

from the carrying case and connect to the inner pump

body outlet as shown in Figure 2-2. Remove the straight

pipe extension (58), and assemble to outer vertical pump

body outlet as shown in Figure 2-2.

3.4.2 Connecting The Gauge (See Figure 2-2)

Select a test gauge that is adequate for the pressure

range desired. Assemble the test gauge to the straight

pipe extension, using adapter nut (62), collar (61), adapter

(60) and reducer bushing (59).

Seal the connection by tightening nut adapter (62) and

adapter (60) until the coned end of the pipe is forced into

the gauge socket. Rotate the gauge for viewing by loos-

ening nut adapter (62), setting the gauge to the desired

position, and re-tightening nut adapter.

Repeat the above procedure to connect the gauge being

tested to the offset pipe assembly (64) or (66).

3.4.3 Bench Space Required

Allow a space:

10 inch (2.5 cm) width

23 inch (5.8 cm) depth

22 inch (5.6 cm) height allows for testing gauges up to 8.5

inch (250 mm) size

3.4.4 Storage Space Required

⁄

inch (27 cm) width

⁄

in (57 cm) depth

10 inch (25 cm) height

Storage space dimensions are larger than actual size of

test pump carrying case by approximately 0.5 inch (1.3

cm), in order to facilitate ease of handling in storage.

3.5 Operation 1327D

3.5.1 Test Gauge Selection

The portable test pump is used for calibrating instruments

such as pressure gauges, pressure switches or other

pressure devices rated up to 10,000 psi (70,000kPa).

First, select the proper test gauge, depending upon the

pressure range desired. When priming the pump a test

gauge rated to 10,000 psi (70,000kPa) should be used.

3.5.2 Priming The Pump

The offset pipe (64 or 66 Figure 2-2) and straight pipe

extension (58) should already be secured in place and the

reservoir should contain the operating fluid (refer to instal-

lation Section 3.4).

Close the release valve (37) by turning it clockwise and

open the air vent by loosening the filler plug (35) a few

turns. The shuttle valve (30) should be pulled outward

from the pump body, the end of the knob approximately

even with the edge of the drip pan. In this position the high

volume displacement mode is selected and the pump is

self-priming. Operate the pump handle several times using

full strokes, until you see fluid appear at the top of the

straight pipe extension. Connect the test gauge to it (refer

to Installation Section 3.4 for proper gauge connection).

Operate the pump handle a few more times until fluid

is observed at the end of the offset pipe. Connect the

gauge or other device to be tested to the offset pipe.

For purposes of priming, the device must be designed

to withstand the full operating pressure of 10,000 psi

(70,000kPa). If a lower range device must be used, ex-

treme care must be exercised to avoid overpressuring

its pressure element. Seal the connection to the device

by tightening nut adapter (62) and adapter (60) until the

coned end of the pipe is forced into its inlet. If necessary,

rotate the device for viewing by loosening nut adapter (62),

set it to the proper position and retighten nut adapter.

Again, operate the pump handle a few more times. After

a few strokes positive pressure will develop and the pump

handle will begin to resist pumping action. Raise the pump

handle to its uppermost travel position. Loosen the bleed

screw (51) a half turn counter clockwise and slowly op-

erate the pump handle through a downward stroke until

fluid flows steadily from the bleed vent. Close the bleed

screw just prior to completing the downward handle mo-

tion. Repeat this action until no air bubbles are observed

in the fluid flow. (Note – the bleed screw must be closed

when the handle is being raised). Push the shuttle valve

in towards the pump body and continue pumping to the

desired test pressure. Open the release valve (37) to vent

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