For the past 15 years, pilot-operated safety relief valves (POSRVs) have effectively and reliably protected economizers on Section I power boilers in overpressure situations, working in tandem ...

The preliminary report from investigators probing the Air India crash that killed 260 people showed that seconds after ...

A manual (“pilot-operated,” as it’s often called) dump valve is simple to install, takes about two hours and costs less than $100.

Many combined cycle power plants are being operated as peaker plants, rather than as baseload units. That can pose a problem for economizer safety valves. Pilot-operated safety valves offer ...

Marotta Controls upgrades safety and performance of its MOPV761 valve. Latest advancements satisfy cross-fleet firefighting system standards.

It’s called the pilot-operated relief valve, and it sits atop the pressurizer attached to the Unit 2 reactor of Three Mile Island. It is often referred to as PORV, and something went very wrong ...

Pilot Operated Check Valves In the symbol example here, the dashed line is used to indicate the pilot line. The pilot line is used to open the check valve and let the flow back through the valve.

The new “22” Series solenoid and air-pilot-operated valves come in three and four-way configurations with 1/8-NPT (F) ports. These valves provide a 40-scfm flow rate at 125 psi and feature ...

Pilot-operated valves can be made with very large main ports, because the magnetic pull is used only to operate a small pilot port. Figure 2 shows a pilot-operated valve with a diaphragm-type main ...

Lee Company’s new High Pressure 500 Pilot Operated Chek is the latest addition to Lee’s line of miniature check valves. This valve acts like a normal check valve until pressure is applied to the pilot ...