Looking for Hydraulic Valve with Manual Reset for Intrinsic Safe Loop

What? You asked for a hydraulic valve that is actuated by pneumatics with a solenoid at 24 VDC. Call your local supplier and they can help you pick the correct materials for your project. It is hard for someone many miles from you, reading from a badly written text to figure out what you want.

Sorry

You can Google/search 'intrinsically safe solenoid coil', 'intrinsically safe hydraulic solenoid valve', or something similar. Several companies make i.s. solenoid valves, and at least one makes i.s. retrofit coils for other companies valves. You may have to use a smaller pneumatic or hydraulic valve as a pilot control for your main valve.

Thanks your adivce.

The hydraulic valve I look for would be used for pilot control in approx. 150 psi of hydraulic pressure. (Not to be Pneumatic)

Other main valve what have large flow rate is also used for hydraulic system.

the both is workable by hydraulic service.

But Customer's requirement of solenoid are :

a. Intrinsic safety

b. 0.8w @24vdc

c. workable @20vdc

I have contacted many suppliers of local and well known manufactures through agencies. But no have solution yet.

Hi,

May I suggest that you contact the sales department of Thompson Valves ltd, in Poole, Dorset, UK. and ask about their Maxseal range of solenoid valves. They have two models that will handle 150psi and are intrinsically safe. Failing that, you could use a pneumatic actuated valve inside the safe zone operated by a standard solenoid valve situated outside the zone.

Hope this is of some help.

Drew

Intrinsic safety doesn't apply to individual items of equipment. It applies to the concept of limiting the power and energy in the circuit below that needed to create an incendive spark through a combination of pieces of equipment and the design of the circuit, including cable parameters. So although the equipment suggested may have an intrinsic safety certificate, it cannot be used intrinsically safely without considering also limiting the power in the hazardous area through the use of a suitable intrinsically safe barrier, installing cabling that enables the energy stored in it to be below that needed to form an incendive spark, and by considering the earthing very carefully.

Nevertheless, the pointer to the equipment is valid and useful to many readers.

The original poster continues to conceal the reason for placing a solenoid valve in zone 0 from the forum. Zone 0 requires intrinsic safety type a - safe with two faults applied to the circuit. Were the equipment to be placed in zone 1 or zone 2, intrinsic safety type a is no longer the only applicable technique, and other methods of protection from explosion becone available that do involve equipment that can be certified individually to maintain explosion protection without reference to the cable parameters, limitation on power, limitation on stored energy, and the earthing applied.

A fair point. I should have written that the solenoid valves are qualified for use in zone 0.

Drew