Dawson HPH 1200, Руководство пользователя

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Important Safety Notes for Bladder Accumulators
1. Use nitrogen gas only
2. All accumulators are supplied precharged to 100bar (1450 psi) unless sent via air-freight – in which case
they will be shipped unprecharged
3. Always use the gas filling apparatus supplied by Dawson. This equipment includes a regulator valve
specifically designed for use with hammer accumulators where the precharge pressure is less than the
supply cylinder pressure.
4. Read the instructions below fully before attempting to adjust the precharge in any accumulator
5. Routine maintenance on the accumulator in-situ or removal of the accumulator must only be carried out
when the hydraulic system pressure has been completely removed.
Accumulator Precharge Pressure
High pressure accumulator – 100 bar Low Pressure Accumulator – 3 bar
Pre-charge Procedure
1. Remove protective cap (1) and sealing cap (2) – see figure 1.
2. Attach the Regulator Valve to the nitrogen cylinder – see figure 2.
3. Attach the charging set (5) to the accumulator gas valve assembly (6) and connect
charging hose (7) between the regulator and the charging set connection.
4. Back off handle (8) anticlockwise until loose. Check gas bleed valve (9) on
charging set is closed and screw hand wheel (10) clockwise to open gas valve.
5. Open nitrogen cylinder valve by turning key (11), cylinder pressure will register on
right hand gauge (12). This pressure should be checked against the required
precharge pressure.
6. Turn handle (8) clockwise until outlet pressure on left hand gauge (13) registers
10% higher than required precharge pressure (110 bar or 3.5 bar). When pressure
on the charging set and outlet gauges are equal, close nitrogen cylinder valve.
7. Turn hand wheel (10) anticlockwise to seal gas valve.
8. Crack bleed valve (9) to exhaust gas from charging hose and remove hose from charging set and replace
hose connection sealing cap.
9. Close bleed valve, turn hand wheel (10) clockwise to open gas valve and crack bleed valve (9) to vent
down to required precharge pressure. Close bleed valve.
10. Turn hand wheel (10) anticlockwise to reseal gas valve, crack bleed valve and remove charging set from
the accumulator.
11. Test accumulator gas valve for leaks using soapy water or similar.
12. Replace sealing cap (2) and tighten with pliers. Replace protective cap using a wrench.
Figure 1