Parker’s 2-way high-response valves with shut-off valve series TEP in cartridge design are particularly suitable for demanding controlled and closed loop applications where high flow has to be precisely controlled at highest dynamics. TEP valves have a 2-stage design consisting of a DFplus pilot valve and a main stage with poppet and LVDT. Additionally, they are equipped with a direction control valve with position control for shutting off the pilot system.



Markets:

• Industrial

• Molding



Features/Benefits:

• High precision – for high quality products, minimum scrap rate and long machine lifetime

• Extremely fast step response – shortens material processing and thus cycle times

• Short delivery time – no warehousing necessary

• Active pilot operated 2-way high-response valve with shut-off valve

• Flow directions A-B and B-A

• Cavity and mounting pattern according to ISO 7368

• Completely mounted and adapted unit with integrated electronics

• Fail save position at electrical and/or hydraulic power down

• 8 sizes

• Shut-off function



Applications:

• General presses

• Injection molding

• Die cast


Function:
With the DFplus pilot valve the TEP achieves extremely fast response times: from 10.5 ms (NG25) up to 28 ms (NG100) with an accuracy of <0.1 % of the nominal flow. The pilot valve actively controls the poppet – independent of the pressure conditions in the main ports. The integrated electronics in the pilot of the TEP has two control loops for the main poppet and the pilot spool.  

In the de-energized position of the shut-off valve, the upper pilot control surface of the main spool is pressurized, the lower one is relieved to tank. Without pilot pressure, the main spool is closed by spring force. Independent of the DFplus pilot valve, the main spool remains always closed, if the shut-off valve is not activated.

If the solenoid of the shut-off-valve is energized, the position of the main spool is controlled by DFplus pilot valve and LVDT.

Please note:
It is basically required that the pilot pressure is at the level of the system pressure. At low system pressure the pilot pressure should be min. 140 bar, when high valve dynamics are desired.

In order to ensure the closed position, pilot pressure is required.