Penn Stainless Products, Inc. - Quakertown, PA (Serving Eastern Massachusetts)
Distributor, Manufacturer, Custom Manufacturer, Service Company
Distributor of valves including stainless steel check valves. Services include shear cutting, plasma cutting, HQ plasma cutting, dynamic waterjet cutting, saw cutting, structural cutting, tubular cutting, pipe threading, gauer processing, machine cutting, polishing & blanchard grinding. Emergency orders accepted & executed 24/7.
www.pennstainless.com/index.php

PH Warehouse - Cambridge, MA
Distributor
Distributor of stainless steel check valves. Swing check valves, forged check valves, lift check valves, swing check valves & high performance check valves are available.
Brand Names: Crane, Powell
www.metpipe.com/products/

Aram Machine Co. - North Billerica, MA
Manufacturer, Custom Manufacturer, Service Company
Custom manufacturer of stainless steel, sanitary, check & spool valves. Other products include various types of fittings, metal to metal seals, check valve seats, check valve spring retainers, high pressure couplings, tees & elbows, autoclave components, transducer blocks, OD/ID left & right hand threaded products, OD & ID pipe threads, washers, studs, bolts & hex nuts, ultrasonic studs & washers. Serves industries such as food, dairy, beverage & bio-pharmaceutical.

Watts Water Technologies, Inc. - North Andover, MA
Manufacturer, Custom Manufacturer
ISO 9001 certified manufacturer of stainless steel check valves. Specifications of stainless steel check valves include 175 psi maximum pressure & 4 in. to 10 in. size. Features include stainless steel body construction with flanged connections & stainless steel linkage parts. Other features include lightweight, non-corrosive & horizontal or vertical position installation. stainless steel, single-detector check valves for fire sprinkler systems are used in fire protection applications to detect leakage or unauthorized use of water in fire sprinkler systems.
Brand Names: Watts

Tantaline - Waltham, MA
Manufacturer, Custom Manufacturer, Service Company
Manufacturer of extremely acid resistant check valves at 15-20% less than Hastelloy® check valves utilizing tantalum surface alloys. Features include higher corrosion & acid resistance than Hastelloy®, titanium & zirconium materials. Types of valves include ball valves, plug valves, check valves, needle valves, globe valves, gate valves, butterfly valves, safety relief valves, back pressure valves & diaphragm valves. Industries served include chemical process, pharmaceutical, oil & gas, offshore, mining, plating, energy & OEM. Tantalum treated products are available with 3-year warranty
Brand Names: Swagelok, Uni Flex