Word list of SMC Pneumatic Product catalogs

By Glenda R. Anderson

Pressure Terminology : Pneumatic equipment

1. Maximum operating pressure difference

The maximum pressure variation (the most notable difference between the inlet and outlet pressure) which is allowed for operation, with the valve closed or open. When the outlet pressure is 0 MPa, this becomes the maximum operating pressure.

2. Minimum operating pressure variation

The minimum pressure variation (the difference between the inlet pressure and outlet pressure) compulsory to keep the main valve stable operated.

3. Maximum system pressure

The maximum pressure that can be applied inside the pipelines. (Line pressure) [The pressure variation of the solenoid valve portion must be less than the maximum operating pressure differential.]

4. Evidence pressure

The pressure in which the valve must be withstood without a drop in performance after holding for 1 minute under prescribed pressure (static pressure) and returning to the operating pressure range. [Value under the prescribed conditions]

e- Words

1. Apparent power (VA)

Volt-ampere is the product of voltage (V) and current (A) .Power consumption (W) : For AC, W = V A cos. For DC, W = VA.Note) cos shows power factor. Cos = 0.6

2. Surge voltage

A high voltage which is temporarily generated by shutting off the power in the shut-off area.

3. Enclosure

A degree of protection outlined in the "JIS C 0920: Water-proof test of electrical machinery/appliance and the degree of cover against the intrusion of solid foreign objects".

Determine the degree of protection for each product.


1. Material

NBR: Nitrile rubber

FKM: Fluoro rubber "Product name: Viton, Dai-el, etc.

EPDM: Ethylene propylene rubber

2. Oil-free treatment

The degreasing and washing of wetted parts.

3. Passage symbol

In the JIS symbol IN & OUT are in a blocked condition, but basically in the case of reverse pressure (OUTgt;IN), there're limit to the block. is used to indicate that block it of reverse pressure might not possible

Since the product stated here is employed under diverse operating conditions, its compatibility with specific hardware must be decided by the person who designs the kit or decides its directions based on obligatory research and test results. The expected performance and safety assurance of the clobber will be the responsibility of the individual that

has determined its compatibility with the product. This person should also continuously review all specifications of the product making reference to its latest catalog information, with a view to giving due consideration to any likelihood of kit failure when configuring the gear.

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