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How should the accumulator charging valve be used?
Published Time:
2024-11-15 17:09
Category:
News Center
Case study
When a hydraulic station is first put into service, it must be pressurized with nitrogen. The nitrogen charging pressure for the accumulator should remain within a specified range, typically between one‑third and three‑quarters of the cylinder’s operating pressure; for this coal mill, the accumulator charging pressure is set at 4–5 MPa. Pressures that are too high or too low will not ensure effective operation. Do not start the pump unit before charging. Before checking the accumulator’s charging pressure, be sure to depressurize the accumulator’s pressurized oil. The correct pressurization procedure is as follows:
(1) First, remove the plastic cap from the accumulator’s inlet valve. Then, using an Allen wrench, gently loosen the metal protective cap on the inlet valve. The nitrogen‑charging device is installed on the accumulator’s inlet valve, with the gas hose connected to both the nitrogen cylinder and the charging unit.
(2) Check the nitrogen cylinder pressure and the accumulator pressure: Fully open the nitrogen cylinder valve; the gauge reading indicates the cylinder pressure. Then, close the cylinder valve, open the gauge’s vent valve to release the nitrogen from the充气管, and finally tighten the vent valve. Rotate the adjustment lever on the充气装置 clockwise; at this point, the pushrod will lift the accumulator’s inlet valve, allowing the nitrogen inside the accumulator to escape through the inlet valve, and the gauge will then display the accumulator’s pressure.
(3) Pressurization: Open the nitrogen cylinder valve to a specific angle; when the gauge pressure reaches 4–5 MPa, tighten the valve. If the pressure becomes too high, first tighten the plunger of the pressurizing device, then slowly open the vent valve to release air from the accumulator bladder. Once the gauge pressure drops to 4–5 MPa, close the vent valve and release the plunger of the pressurizing device.
(4) Check whether the accumulator pressure has been adjusted to the specified value. If it has, slightly loosen the vent valve to release the gas from the charging device, then tighten the vent valve and remove the pressure gauge and tubing. Inspect the accumulator’s inlet valve for leaks; if no leaks are detected, tighten both the metal and plastic protective caps. Charging is now complete.
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What are the causes of severe pressure drop and shortened service life in bladder-type accumulators?
What are the causes of severe pressure drop and short service life in bladder-type accumulators? The structure of a bladder-type accumulator is quite simple, consisting mainly of an oil chamber surrounding the bladder and a gas chamber equipped with a gas‑tight seal. During operation, the hydraulic fluid must be connected to the hydraulic circuit; when the system pressure rises, the fluid flows into the accumulator, compressing the gas until the pressure in the system pipeline stabilizes.
How can we reduce failures when an accumulator malfunctions?
If an accumulator malfunctions, its performance will be directly affected, potentially leading to abnormal pressures and system failure. Therefore, it should receive close attention during routine operation, and appropriate measures must be implemented to mitigate risks. So, how can we minimize failures when an accumulator malfunctions? The following sections address this issue.
Accumulators are intriguing components in hydraulic systems, analogous to capacitors in electrical circuits or springs in mechanical systems. As critical energy‑storage elements, they serve a variety of sophisticated functions, including hybrid‑power applications, shock absorption, pressure stabilization (and sometimes flow‑rate regulation), and the rapid release of stored energy to simulate impacts.
Is a bladder-type accumulator suitable for use in series with gas cylinders or cylinder banks?
1. Bladders typically have a shorter service life than piston‑type accumulators, and their quality varies significantly among different manufacturers. 2. Many factors can shorten a bladder’s lifespan and lead to rupture, including variations in the bladder’s intrinsic quality and durability; improper handling during assembly (e.g., failure to pre‑fill with fluid for lubrication); incorrect procedures during pre‑charging (e.g., insufficiently slow inflation); errors in calculating the pre‑charge pressure; oil‑port flow velocities approaching or exceeding 7 m/s; single‑stroke reciprocation times of 10 seconds or less when used for energy storage; collisions between the bladder and check valves during operation; large temperature fluctuations (including significant seasonal differences); prolonged lateral vibration; fluid‑induced corrosion; and inertial impacts from minute solid contaminants in the working medium, among others.
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