Category Archives for Process Alarm

EBV Fireproofing

If possible, do not install an EBV and its actuator in any fire zone. If a non-fail-safe EBV is installed in a fire-hazardous area, then fireproof all components within the fire zone. These components include the actuator, the wiring, the … Continue reading

13. June 2018 by Juan
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EBV Electrical Power and Pneumatic Supplies

The power supply and control signals for the actuator of the EBV are electric, pneumatic (gas or air), or hydraulic fluid. In each of these cases, the power and control system driving the actuator must be available during an emergency … Continue reading

13. June 2018 by Juan
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EBV Speed Control

When a valve is closed quickly in a line containing flowing liquid, the inertia of the flowing liquid increases the pressure at the valve. This effect is called surge, and the increase in pressure is called surge pressure. Surge pressure … Continue reading

13. June 2018 by Juan
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EBV Pneumatic Reserve Tank

To ensure a source of power during an emergency, double-acting, energize-to-trip piston actuator requires a pneumatic reserve tank. To minimize the probability of a spurious trip, add a reserve tank to the spring return actuator. The reserve tank should be … Continue reading

13. June 2018 by Juan
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EBV Position Indicating Lights

Position indicating lights may be required for the EBV and for the manual bypass valve (if there is one). Locate these lights in the field, in the control house, or in both places. If position lights are required, there should … Continue reading

13. June 2018 by Juan
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EBV Position Indicator

For quarter-turn EBVs, a highly visible, impact-resistant, beacon-type, valve position indicator can be stacked on top of the limit-switch enclosure (or on top of the actuator if limit switches are not required). Electric motors are provided with full open and … Continue reading

13. June 2018 by Juan
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EBV Fusible Plugs

A fusible plug, installed in the tubing run above a potential fire source, can send either a spring-return or double-acting piston actuator to the failure position during a fire.

13. June 2018 by Juan
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EBV Remote Pushbuttons

Remote actuation capability is important because the initial release of hazardous aterial can occur without a fire. If hazardous material is released, the operator may find it difficult to enter the area safely to isolate and shut down the equipment. … Continue reading

13. June 2018 by Juan
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EBV Solenoid Valve and Pneumatic Pilot Valve

A solenoid valve (a combination control solenoid and three-way air valve) is necessary with a remote, electrical, hand switch or shutdown system. A de-energize-to-trip or fail-safe solenoid valve is recommended. To prevent spurious trips, back up the power source with … Continue reading

13. June 2018 by Juan
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EBV Auxiliary Limit Switches

Auxiliary limit switches have two purposes: • To shut down or operate associated equipment when the EBV either starts to move or has completed its movement. • To send the valve position indication signals and alarms to remote locations. The … Continue reading

13. June 2018 by Juan
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