Airgas Model E444B660 Stainless Steel High Purity Two Stage Positive Seal Regulator With 1/4" FNPT Connection

Tied, Convoluted Diaphragm Design provides positive shutoff and minimizes creep. Ultrasonic Cleansing and Electropolishing to a 32-Ra Surface Finish allows high-purity integrity and contamination-free flow stream. (15 Ra electro polished surface is optional with faceseal connections - not available with NPT or compression) Large, Hastelloy® C22 Convoluted Diaphragm provides maximum sensitivity, minimum droop, and a leak-tight bonnet seal without the use of a contaminating soft seal. PCTFE Seat permits positive seat closure and provides wide media compatibility range. Diaphragm Packless Valve (with standard 1/4" Compression fitting) permits positive shutoff and flow control. Optional Porting (consult Airgas) for special port configurations: butt-welded, zero-clearance fittings (VCR®, Vaculok®, UltraSeal®, etc.) or space saving, internally machined, high-purity porting compatible with fitting styles mentioned above.

Maximum Rated Inlet Pressure: 3,500 psig Outlet Pressure Ranges: 0-60 psig Flow Capacity: Cv=0.04 Ambient Operating Temperature: -40° F to +165° F Designed Leak Rate: 2 x10-8 ccs (helium) Weight: 4 lbs Ports: ¼" FNPT Delivery Gauge: 0-100 Capacity: 250 scfh @ Max Delivery Pressure Decay Inlet Characteristic: 1.17/100 psi

These two-stage positive-seal regulators feature convoluted, Hastelloy® C-22 diaphragms that provide maximum sensitivity, minimum droop and a leak-tight bonnet seal. Type 316 stainless steel internal components are ultra-sonically cleaned and electropolished to a 32-Ra surface finish for applications where a contamination-free flow stream is critical. Optional 15 Ra electropolished with faceseal. A rugged, mechanical linkage connecting the diaphragm and valve stem significantly reduces the possibility of pressure creep. A PCTFE seat provides positive closure and is compatible with a wide range of mildly corrosive or corrosive gases. Each single-stage positive-seal regulator is designed with two 10 x 32 UNF-threaded body holes for bracket or panel mounting.