Wika CPP1200-X Manuel d'utilisateur télécharger pdf (Page 19)

WIKA operating instructions model CPP1200-X

14076968.01 12/2013 GB/D

4. Design and function

4.3.1 Spindle pump

The spindle pump is bolted to the reservoir/high pressure cylinder block fastened to the

base unit. A sectioned view of the pump is shown. The rotating handwheel (C) which

is operated by the spokes (D) is attached to a threaded spindle (E). The spindle is

supported in a sintered bearing (F). As the spindle (E) is rotated, it drives a non-rotating

ram (E and K) forward, the thrust being taken by a needle thrust bearing (G). The large

diameter of the ram (H) in the barrel of the pump (J) primes the pressure system and

provides the low pressure up to approximately 140 bar (2,000 lb/in²). The small diameter

of the ram (K) in the reservoir/ high pressure cylinder block provides the higher test

pressures up to 1,200 bar (16,000 lb/in²).

4.3.2 Reservoir

A liquid reservoir is provided on the top of reservoir/high pressure cylinder block. The

reservoir is provided with a translucent cover to enable the reservoir level to be monitored.

A plug in the middle of the reservoir cover enables the reservoir to be lled or topped up

(the plug is removed whilst the test pump is in use). The reservoir contains enough liquid

(approximately 150 cm³) to enable normal operation of the test pump to be carried out.

Low pressure ram displacement = 60 cm³

High pressure ram displacement = 10 cm³

4.3.3 Control valves

Two control valves are provided on the top of reservoir/high pressure cylinder block.

The valve mechanisms are built into the reservoir/high pressure cylinder block and they

control the ow of liquid through internal drillings in the reservoir/high pressure cylinder

block. The rear valve is referred to as valve A and is used to control the output from the

high-pressure ram of the spindle pump. The front valve is referred to as valve B and is

used to control the ow of liquid to and from the reservoir.

4.3.4 Connection blocks

Pressure supply pipes from the spindle pump are terminated at two pressure blocks

mounted on the base unit. The pressure blocks are tted with threaded bosses

projecting up through the cover plate of the base unit. These threaded bosses enable

the delivered test connections to be directly screwed on to them, and it is also possible,

using threaded adapters, to connect the various sizes of measuring instrument

connections. Oil cups are tted to the unit cover around the threaded bosses of the

connection blocks to catch any oil drips from the gauge stand during gauge tting and

removal.

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Wika CPP1200-X Manuel d'utilisateur Page 19