The Universal 521DP-RF-15 Female Double Poppet Safety Valve is a three-piece design with 1-1/2" NPT (National Pipe Thread) and two independent seals for easy replacement. No need to remove the top poppet as with competitive products. Also, no need to buy an expensive replacement poppet top. This item comes standard with Female top thread and includes 2-inch external male bottom threads for easy connection to secondary containment piping. This reduces the chance of fire and contamination.

Features:

• Pressure relief (upper poppet) to prevent pressure build-up
• Both poppet and seats are completely independent of the shear section, so when sheared the valve assures a 100% liquid tight seal 
• The single link design provides ease of operation and reduced maintenance
• An air test port allows line testing without breaking the integrity of the line
• Raised bosses provide secure anchoring

Application:

• Designed to immediately stop product flow inthe event of fire or collision at the dispense
• Maximum safety in a double-poppet safety valve with two independent seals

Benefits:

• UL® Listed  (Underwriters Laboratories, Inc.) 
• Conforms to NFPA 30A
• Secondary Containment, 2-inch external threaded valves are designed to meet your secondary containment needs
• Universal offers you a 70-year tradition of quality without recalls!
• 100% liquid tight seal (even with the top off)
• Emergency Shut-off Valve is designed to immediately stop product flow in the event of fire/collision at the dispenser
• 1.5 inch NPT opening allows for minimal flow restriction
• This valve can be "Boss" or "U-Bolt" mounted
• Built-In Air Test Port  allows pneumatic testing of the entire pumping system without breaking the line
• Fusible link allows the valve to close automatically to reduce fire hazard
• Easy-to-replace top allows for easy slide on/off, without lifting or tipping the dispenser
• Zinc Plated for maximum corrosion resistance
• Independent middle shear section allows replacement without draining the dispenser
• You will save time & potential environmental expense due to patented three-section valve which does not need to be drained before replacement

Construction:

• Zinc-plated cast iron body and top
• Stainless steel spring and shaft
• Buna-N seal