Complies to API 602 and ASME B16.34 standards. A compact but extremely sturdy design for high pressure-temperature service. Available with bolted or welded bonnet. Meets API 624 and ISO 15848-1 fugitive emissions standards. Packing rings are pre-compressed in the packing chamber to ensure equal stress distribution, effectiveness of all rings and a high integrity seal. For welded bonnet valves, the bonnet is threaded in and torqued to an engineered torque value and the body bonnet joint is strength-welded, offering double protection against leakage. (body/bonnet threads and strength-weld). CoCr alloy hardfaced wedge (optional) ensures low friction and long service life. Fully guided wedge reduces wear on seating surfaces. For Class 1500 valves and for steam service, seats are seal-welded to the body. Repairable two-piece stem drive. Pre-positioned field injection ports for precise application of low emissions (Low-E) injectable packing through the bonnet (applies to bolted bonnet gate NPS 1/4–2 (DN 8–50) Class 150–1500). Optional designs available with double packing, leak-off connection, live-loading, and packing blowout for easy removal of old packing.

This series features an integrated flood sensor with SentryPlus Alert® Technology to detect excessive water discharges from the relief valve. Activated through an add-on connection kit, the sensor can trigger the alert system sending notification of flood detection to facility personnel. Connection kits are available for BMS and cellular communication.

Series LF957RPDA-FS reduced pressure detector assembly backflow preventers provide protection to the potable water system from contamination in accordance with national plumbing codes. Used in health hazard applications to protect against backsiphonage and backpressure and to monitor unauthorized use of water from the fire protection system.