Gadren Machine Company manufactures vacuum relief valves available with 1/4" to 3" valve sizes, and flows of 5 scfm to 150 scfm. Constructed of brass or stainless steel, the vacuum valves are for use on low-pressure tanks, steam vessels, and other vacuum equipment that is subject to damage from atmospheric pressure.

A & N Corporation manufacturing three types of vacuum shutoff valves including ball, poppet and gate valves. The vacuum ball valves are available with port sizes ranging from 1/8" to 2 1/8", while poppet valves are available with 90-degree angle, in-line, and angle in-line body styles. The vacuum gate valves are available with nominal apertures ranging from 1.5" to 12".

Anver manufactures a range of vacuum valve types including vented ball, slide, miniature ball, flow sensing, relief and check valves. Vacuum check valves are available in 1/4" to 2" NPT sizes, and feature maximum pressure of 230 psi and temperature of 0 to 200F.

Flomatic manufactures air and vacuum valves for clean water and sewage applications. The valves are available in 1/2" to 3" sizes, with maximum temperature of 150F and inlet maximum pressure of 300 psi. The vacuum valves have a cast iron body and stainless steel trim, with threaded female x female connections.

Edwards Limited manufactures a number of vacuum valves, including in-line isolation, ball, manual operation isolation, pneumatic operation isolation, solenoid operation isolation, backing/roughing, soft-start, stainless steel gate, gate, butterfly, needle, electro-pneumatic control, and ISO gate vacuum valves.

GNB Corporation manufactures vacuum valves constructed of stainless steel, carbon steel, or aluminum. Vacuum valve types include gate valves, slit valves, angle valves, and pendulum valves.

Humphrey Products manufactures vacuum valves available with manual/mechanical, piloted, or solenoid actuators. The valves feature flow rates ranging from 0.01 Cv to 2.6 Cv, and a no lubrication/contamination tolerant design.

HVA LLC manufactures and supplies precision stainless steel and aluminum vacuum valves used in the semiconductor, solar, scientific research, biopharmaceutical, vacuum coating, and LED industries. Vacuum valve types produced by the company include gate valves, rectangular valves, angle valves, low particulate valves, large rectangular valves, throttle/isolation valves, harsh process valves, door valves, and 3-position valves.

Kurt J. Lesker Company manufactures a line of vacuum valves types including rectangular gate, gate, butterfly, ball, angle, inline, diaphragm, vent, bakeable all-metal leak, all-metal, conductance control, protection gate, up to air vent, water and gas.

MKS Instruments manufactures a line of stainless steel vacuum isolation valves including safety shut-off valves, soft-start valves, and angle/in-line vacuum valves that are heated or unheated - with manual, pneumatic, or electromagnetic actuation.

Nor-Cal Products supplies vacuum isolation valves including poppet valves, linear gate valves, and pendulum valves used in semiconductor and compound semiconductor processing, and UHV research.

North American Machine Works distributes safety relief vacuum valves manufactured by Farris Engineering. Valve types include flanged, threaded, pilot operated, and steam.

Val-Matic Valve Manufacturing Corp. produces clean water air/vacuum valves and wastewater air/vacuum valves. The wastewater valves are available in 1" to 8" sizes and tested to AWWA C512 requirements. The clean water valves are available in 1" to 20" sizes and are WQA certified lead-free. Both vacuum valve types admit large quantities of air to prevent loss of pressure during power failures, line breaks, and drainage.

VAT Inc. manufactures a line of vacuum valves including gate, pendulum, control, transfer, angle, diaphragm, gas and special valves for accelerators/synchrotrons. The valves are available with inside diameters ranging from 5/8" to 50".

Industrial Specialties Mfg. is a manufacturer and distributor of miniature pneumatic, vacuum and fluid circuitry components. Available products include a brass vacuum relief valves in 1/4", 3/8" and 3/4" connections for vacuum pumps up to 3 HP.