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Pressure/Vacuum Relief Valve w/Pipe-Away and Pressure Spring

Model 1221B

Pressure/Vacuum Relief Valve w/Pipe-Away and Pressure Spring

Model 1221B is used for pressure and vacuum relief where vapors must be piped away. Escaping vapors are piped away through a flanged outlet connection. This helps to provide increased fire protection and safety. The 1221B Pressure/Vacuum Relief Valve is a spring-loaded version of the 1220 PVRV for use at pressures of 1 PSIG and above.

Specifications

Size: Sizes 2" (DN50) through 12" (DN300)

Material: Available in aluminum, carbon steel, stainless steel, fiberglass and other materials

Pressure: 1 psig to 15 psig (68.9 mbarg to 1.03 barg)

Vacuum: 0.5 osig to 12 psig (2.15 mbarg to 827 mbarg)

Certification: ATEX and PED Approval

Features

• The flanged outlet connection allows escaping vapors to be piped away, instead of released directly to the atmosphere
• Peripheral and central seat guides ensure reliable, repeatable performance
• A wide seat and air-cushion seal keeps leakage low long after the valve is put in service
• Self-draining housing body and drip rings protect seating surfaces from condensate and freezing, increasing operational reliability
• Fluoropolymer seating diaphragms are standard to minimize sticking caused by resinous vapors and atmospheric moisture

Options

• 150# ANSI, PN10, PN16, JIS drilling classes available
• Buna-N, Fluoropolymer, FKM and other seating diaphragms
• Steam Jacket
• Spacer

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