Singer Valve’s 106-PR-SM and 206-PR-SM series pressure-reducing control valves have a backup system that is independent of the primary operating system. The secondary pilot provides full downstream protection as it continually monitors and can respond quickly to downstream pressure changes if the primary system fails. Maintenance schedules may be extended as pressures continue to be controlled, even in the event of failure with the primary system. Under normal pressure-reducing conditions, the primary pilot senses the downstream pressure through a connection at the valve outlet. Under flowing conditions, the pilot reacts to small changes in pressure to control the valve position by modulating the pressure above the diaphragm in the lower operating chamber. The downstream pressure is maintained virtually steady at the pilot setpoint that is adjustable. 604/594-5404; www.singervalve.com.