VALVE. 300 SERIES CHECK VALVES. Fixed cracking pressure pressure is defind as the downstream pressure at which the check valve closes bubble-tight.

Bubble tight shut off, a phrase descri the sealing ability of a valve. During air pressure testing of a new valve in the closed position, leakage past 

EBA's unique Bubble-Tight Positive Seal Dampers and Valves are used in critical and hazardous environments, such as nuclear power plants and high risk laboratories for air isolation. They are commonly used in bag-in/bag-out filters for filter decontamination and in ventilation ducts of BSL3 and BSL4 laboratories to seal up all ventilation paths

Manufacturer and distributor of bubble-tight shut-off check valves. Available with 316 stainless steel body, covers, poppets, cover glands and springs. Stock 

Flexible Seal Seat™ for zero leak (bubble-tight) seal No threaded connections (avoid potential leakage) Both O-Ring seals positively secured Wide relief adjustment range 50 to 2000 PSI (3.45 to 138 bar) Tamperproof Nylok® adjustment set relief pressure/prevent slippage Poppet stop inside valve body prevents spring from bottoming out

An automatic or manual seal system using instrument air is furnished as an integral part of the valve and used in conjunction with a manual or automatic actuator. Shan-Rod engineers select the most compatible materials and elastomers for the service encountered in the chemical, refining, steel, paper and power industries. Bubble tight shut-off

many maintenance-free cycles and still accommodate “bubble tight” shut off. When a check valve is needed to prevent backflow, NIBCO has a complete 

isolation valves and is regarded as tight shut off for many types of industrial valves. It is superior to FCI 70-2 Class VI (EN 60534-4) (see Table 7). In fact even for metal seat valves the API 598 leak acceptance criteria for metal seated valves (excluding check valves) allows less leakage than FCI 70-2 (ISA-S75.19) Class VI (EN 60534-4).

Valve Check Inc. is a manufacture of high-quality check valves offered in a variety of sizes Design: High Flow, Bubble Tight Seal, Low Crack Pressure.

A precise flow control valve and a bubble-tight shut-off valve combined in one. These valves exceed Class VI offering bubble-tight shut-off with zero 

No bubbles during the test duration means it was "bubble-tight" and the valve passes the test. You will waste a lot of time testing tight