Having a hydraulic accumulator is a great advantage in the field of hydraulics. It helps to minimize shocks, compensate for leaks and thermal expansion, and dampen vibrations. But, it is important to be careful in handling it. In case of a malfunction, an accumulator safety valve must be attached to it to protect the rest of the system.
Using the accumulator improperly can damage the parts. It is better to use dry nitrogen for charging, and never to grind or cut the accumulator shell.
In most countries, accumulator safety valves are required. However, accumulators have a label on the shell warning of the danger of compressed air. Unless you are an expert in this area, you should be cautious.
An accumulator unloading valve consists of three ports. The left port is the pilot relief, and the right is the full flow check valve. The pressure is dropped by the unloading piston. When the pressure drops below the predetermined minimum, the pump is unloaded. This relieves the pressure, and the accumulator is reloaded.
It is necessary to know the accumulator safety valves, their specifications, and where they are installed. This can save you from replacement costs.
The accumulator safety block is a multi-functional valve that acts as an emergency shut-off device and pressure relief valve. It protects the accumulator and the operating system against over-pressurization or system failure.
It also protects the accumulator from contamination and excess pressure on the fluid side. The HYDAC safety and shut-off block is designed to meet the requirements of the European Pressure Equipment Directive.