Monthly Archives: June 2016

How Reliable is Your EBV?

Emergency block valves are critical in isolating flammable and toxic media, but once installed they can become an afterthought. When the time comes for them to be used, will they perform as expected or will they be frozen in place due to lack of maintenance? If they are operational, are they easy to maintain? The valves may have been installed long ago, so are parts still available? If you answered ‘yes’ to any of those questions, BI-TORQ Valve Automation’s new R-EBV is the answer.

FEATURES

The R-EBV is a field re-settable emergency block valve designed for refineries, chemical plants and other facilities that deal with flammable or toxic media. The R-EBV’s modular design and small foot print make it easy for one person to operate/test and maintain each assembly as part of a quarterly or annual maintenance program.

What really sets the R-EBV apart is its ability to provide automatic closure three ways – localized heat from a fire, a remote electric signal or by push button control. This ensures that no matter what the situation, the R-EBV can shut down a piping system or tank when required.

MAJOR COMPONENTS

The valve portion of the assembly is quarter-turn API 607 fire safe valve. The R-EBV can be supplied as a complete BI-TORQ package with one of our fire safe valves or we can assemble an AML or customer-specified valve to the topworks at our facility.

A declutchable gear override is used in the design for arming and manual operation. A handwheel operator is standard, but other options are available for situations where spatial constraints are a concern.

The stainless steel triggering mechanism and switch linkage enclosure is laid out for easy access and part replacement. The enclosure is fully covered for safety and includes a red indicator to show the unit is armed.

The R-EBV incorporates a hydraulic dashpot to allow the closing speed of the valve to be adjusted to avoid noise, vibration or pipe breakage due to hydraulic shock.

A domed limit switch box with integral solenoid is the most customizable aspect of the R-EBV. The switch portion provided continuous position feedback and visual indication while a signal to the solenoid will trigger the assembly to close. The solenoid also comes with a push button override for periodic testing. The standard switch assembly has a flame proof enclosure, 2 proximity switches, and a stainless steel solenoid valve, but can customized to meet the specifications of an end-user.

Once released by the triggering mechanism, the spring pack provides torque necessary to close the valve. With torques available to 22,000 in.lbs, the R-EBV can fit on large fire safe valves at refineries and power plants. The reliable clockspring design of the spring pack allows for a smooth torque curve, ensuring that when the situation dictates the valve will shut to isolate a tank or piping section.

BI-TORQ’s dependable PN series rack and pinion actuator is used to hold and release the spring pack. The spring return actuator in the design is considerably smaller than what you would find on a purely pneumatic EBV. This allows for a much lower air consumption rate, saving money at the facility.

The air inlet of the pneumatic actuator includes a fusible plug to allow for automatic closure due to ambient heat from a fire. The plugs are available in a variety of temperatures from 165° F through 450° F.

The valve mounting hardware is all stainless steel and engineered to withstand an internal vibration test.

SUMMARY

As demonstrated above, R-EBV’s versatility and customizable components ensure that the units will be the standard in the emergency block valve market for decades to come.

To find out more about this product, including applications and how to specify a R-EBV, please contact Rich Caudillo at rcaudillo@bitorq.com to set up a webinar or to schedule onsite training.