Hydac Pressure Switches
A pressure switch monitors a pressure and switches once a set value is exceeded or undershot. On the electronic EDS series, pressure range, output type and electrical connection are specified separately. A range chosen too wide costs resolution exactly where the working point sits.
Pressure dropping, cause unclear?
On-site fault finding on hydraulic systems: own technicians, measuring equipment on board, across all manufacturers.
FAQ
Frequently Asked Questions
Mechanical or electronic?
A mechanical pressure switch closes a contact and is enough for plain limit monitoring. Electronic switches in the EDS series additionally deliver a measured value, can be parameterised on the device and pass the pressure on to the controller.
How do I read the pressure range from the designation?
The number group in the rear part of the type code gives the nominal pressure in bar, for example 0400 for 400 bar. The exact range and the permissible overload are listed in the technical data of every article.
What happens above the measuring range?
Short peaks are absorbed by the overload range; sustained operation above it destroys the sensing cell. Choose the range so the working pressure stays clearly below the nominal pressure, and check the permissible overload in the technical data.
More ranges
Counterbalance Valves
During lowering the counterbalance valve does the braking work, so the lowering speed is set by the control system and not by the load. If that braking action is missing or the valve is wrongly sized, the load sags on start-up and the lowering motion turns jerky.
Bladder Accumulators
A bladder accumulator is a hydropneumatic pressure vessel: inside the steel shell, an elastic bladder separates the nitrogen-precharged gas side from the oil side. When system pressure rises the accumulator takes in oil, and when it falls it gives the oil back. That is how you store energy, damp pulsations, absorb pressure surges or compensate for leakage losses. Four figures narrow the selection: nominal volume, permissible working pressure, port and the elastomer of the bladder, which has to suit the medium and the temperature. Typical nominal volumes range from about 4 to 50 litres with pressure ratings up to 350 bar. PTS supplies bladder accumulators from Parker Olaer, HYDAC and Bosch Rexroth from stock, plus mounting clamps, seal kits and replacement bladders, so an accumulator can be repaired instead of replaced outright.
Heavy-Duty Cylinders
PTS supplies hydraulic heavy-duty cylinders from stock at 50 to 150 tonnes of nominal force, with strokes of 50 to 300 mm, single- and double-acting in a compact design. Forces and strokes outside that range are available as further versions on request.
Flange Spreaders
Flange spreaders act on a seized flange joint. It is opened for maintenance or assembly work. The gap has to open evenly, or the sealing face is damaged. How much spreading force is needed depends on the size of the flange and how tightly it is seized.
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