Description
Pressure/Vacuum Relief Valve w/ Pipe-Away & Pressure Spring
Model: 1221B
Description
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.
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
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
Options
150# ANSI, PN10, PN16, JIS drilling classes available
Buna-N, Fluoropolymer, FKM and other seating diaphragms
Steam Jacket
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Technical Documents for Download (PDF)
Model 1220 Series Datasheet
Valves & Tank Equipment
General Arrangement Drawing 1221B
IOM for Models 1201B, 1202B 1203A, 1221B, 1222B, 1223A, 1261A, 1301A, 1361A, 2301A
