The Crispin Air and Vacuum Unit, with its orifice the same diameter as its inlet, allows large quantities of air to be vented from systems being filled with liquid. The same holds true in reverse for vacuum conditions when the system is drained.

Its design is such that the velocity of air passing through the valve will not blow the float shut at normal design volumes. It will not close until the arrival of liquid in the valve, and will not open to vent accumulating air as long as the system is under pressure and in operation.

Air and Vacuum Valves are available with stainless steel floats and either standard top or protectop in sizes up to and including 24.” All CRISPIN Air and Vacuum Valves have also guides which direct the float onto the seat upon closure. These guides are peripheral to the float, and fixed to the body or the cup and hanger assembly.

This peripheral guide system allows unobstructed closure because there are no guide bushings to collect dirt and then bind, and there are no shafts to bend or deform, which would prevent a drip tight seal.

All CRISPIN Air and Vacuum Valves have standard Buna-N seating material with a Shore durometer of 70-80. This standard seat allows drip tight closure beyond 4-5 PSIG. Occasionally, a gravity system operates at pressures less than 10 PSIG. These applications require a soft seating material which will prevent leakage down to 2 PSIG. This soft seating material should not be applied to systems with operating pressures greater than 50 PSIG, or high pressure leaks may occur around the seat. Crispin Valve, 600 Fowler Ave., Berwick, PA 18603 • 1-800-AIR-VALV • T: (570) 752-4524 • F: (570) 752-4962 • WWW.CRISPINVALVE.COM

Specifications

Air & Vacuum Valve(s) shall be installed at high points in the main line or as directed by the engineer to release the air in the main during filling, or allow it to enter the system when draining, or when the system is subject to negative pressure.

The valve(s) shall operate by sealing the Buna-N rubber outlet seat with a peripheral float as the liquid enters the valve chamber to raise the float. All Crispin Valves are hydrostatically tested at 150% of their maxiumum working pressure.

1”-4”—The valve(s) shall be constructed with a cast iron body, and top flange with stainless steel trim, and shall have a____________” NPT screwed inlet and outlet, or ANSI Class (125, 250) flanged inlet with NPT screwed outlet. The peripheral guided float shall be stainless steel.

The valve(s) shall be Crispin Model______________, as manufactured by Crispin-Multiplex Manufacturing Co., Berwick, PA.

Option: A protectop shall be supplied to prevent debris from entering the outlet of the valve.

Option: [Where pressures are greater than 300 PSIG.] the valves shall be ANSI Class_____________flanged inlet connection and shall have a (steel, stainless steel, or ductile iron) body, top and inlet flange.

The year was 1905. Theodore Roosevelt was in the White House. Ty Cobb was playing his rookie season in the National Baseball League; and a peaceful crowd of pensioners was fired upon in front of the Russian Czar’s Winter Palace in St. Petersburg, giving rise to the “Bloody Sunday” massacre, and a revolution that would change the world.

At Princeton University, a young man named Albert Einstein did his graduate thesis on something he called “The Theory of Relativity.” Eleven-year-old Frank Epperson invented the Popsicle. Out west, a little town called Las Vegas was officially chartered, and in Berwick, Pennsylvania, a young man named Clarence Crispin gambled that a product he called the “Crispin Air Valve” could revolutionize not just his family’s business, but also the fledgling waterworks industry.

Fresh from the Engineering School at Cornell University, Clarence wanted to find a way to boost output at the family-owned Berwick Water Company. Early attempts sought to pump water through a wood stave pipe that ran along the bed of the local Susquehanna River. However, the pipe kept collapsing, destroyed by a large vacuum of air that built up as the pipe drained. With his mechanical background, Clarence designed a valve that could release air from a water line while water was running through it, all without leaks or breaks in the water’s flow. He then set about building his patented “air valve,” starting a foundry and fabrication business called the Multiplex Manufacturing Co.