check valve

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check valve

A valve that permits fluids or gases to flow in just one direction. Check valves are used in infusion sets to prohibit backflow of fluids during intravenous therapy.
See also: valve
References in periodicals archive ?
The purpose of the non-return valve is to ensure molten plastic flows in only one direction.
The injector is mounted on the melt cylinder directly in front of the rear non-return valve. After the supercritical fluid has entered the mixing zone of the screw, it is finely dispersed by shearing and mixing processes, and by diffusion in the melt.
A sintered plastic filter guards against fine powder being released and protects the non-return valve's operation.
Q3 fixed flow meter q3 2.5 m 3 / h, r 160 with g 3/4 "b connection, l 190 mm long and non-return valve standing q3 6.3 m 3 / h, r 160 with g 1 1/4 "b connection thread, l 260mm long and non-return valve q3 fixed flow meter q3 16 m 3 / h, r 160 with g 2 ~~ b connection, l 300 mm long and non-return valve
Along with the innovative screw, Nordson supplies a custom-designed, poppet-style non-return valve, whose free-flowing channels prevent polymer degradation and whose rapid shut-off ensures shot-to-shot consistency.
The screw, heater bands, and barrel have the job of melting and injecting hot plastic into the part cavities, but everything depends on the non-return valve or check ring to function properly.
One of the most important details in injection molding is the non-return valve or check ring.
It consists of a special screw and barrel combination plus a non-return valve. Spirex says the system has outperformed four other commercial systems (including a GP and a barrier screw) in recovery time, percentage of maximum torque used, and plasticating rate in tests with five PP resins, two PEs, two nylons, ABS, and PET.
Unveiling QSO Quick Shut-off non-return valve that delivers both high flow and rapid material shutoff for part weight consistency.
Glycon Corp., Tecumseh, Mich., has agreed to allow Spirex Corp., Youngstown, Ohio, to make and sell the Glycon QSO (quick-shutoff) non-return valve. Glycon will also continue to sell the valve.
Tenders are invited for Non-return valve enquiry for stock purpose

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