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Intrinsically Safe Valves

  Clippard Intrinsically Safe Solenoid Valves

The design of Clippard electronic valves is a deceptively simple arrangement with a minimum of operating parts, and remarkably straight forward low power operation. The "spider" is the only moving part and its motion to operate the valve is a mere 0.007" travel. Low voltage DC inputs, signals from simple manual switching up to computer directed systems, move the spider in extremely fast response time… 5 to 10 milliseconds. The unit uses extremely low power (0.67 watts at the rated voltage) and is cool running. The valves are lightweight, compact in physical size and mount easily in space-saving packages. The Intrinsically Safe Series Solenoid Valves are available in 2- and 3-way configurations and feature low power consumption. In-line or manifold mount available. Normally-Closed or fully-ported. Multiple connection options.

What is Intrinsic Safety?

An intrinsically safe system is one in which all electrical devices and their associated circuits are designed such that they can neither arc nor spark with sufficient energy to ignite the hazardous substances around which they are being used. Put another way, the energy stored from the inductance of the circuit components must be unable to generate a spark or arc at the circuits open point during current circulation that is capable of igniting the hazardous materials present when they are in a fuel/air mixture that is most favorable for ignition.

What is Entity Approval?

According to Intrinstic Safety standards, there is no requirement for authorized laboratory certification of system-wide Intrinsic Safety if the designer can determine, with certainty, that the physical and electrical parameters of every system component has been met sufficient to ensure that system-wide intrinsic safety has been maintained.

An "Entity Approval" is documentation stating that a device is Intrinsically Safe in specified hazardous atmospheres if the stated physical and electrical conditions contained in the approval are met. By meeting the requirements of "Entity Approvals" on all components of a system, the designer can more easily document that system-wide intrinsic safety has been maintained.

The Clippard EI-EIO Series valves hold the Entity Approvals listed and supporting documentation is available to our customers.

View Typical Intrinsically Safe Circuit