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Check valves are available in numerous types, styles and shapes. Generally a valve manufacturer builds only one type of check valve. APCO builds six (6) types and fourteen (14) styles. We offer the consulting engineer open, objective and unbiased information about a broad range of check valves; their proper selection and application. The purpose of this treatise is to collect and condense the many desirable and undesirable features of the most common type checks into a single source. With this single source of information we will simplify the design engineer's check valve selection and make this selection accurate and compatible with the application intended. Following are six (6) basic types of check valves. Of these basic types, three (3) are available in several forms:

SWING CHECK VALVE LIFT CHECK FOOT CHECK
A. Single Disc
(Conventional Type)		 A. Poppet
(Center Guided)		 A. Swing
(Multi Disc)
B. Dual Disc
(Split Swing Discs) 		B. Disc
(Self Guiding)		 B. Lift
(Single Poppet)
C. Single Disc
(Angle Seating) 		C. Ball
(Self Guiding) 		C. Single Ball
SLANT DISC CHECK FLAP CHECK CONTROL DISC CHECK
A. Single Disc
(Pivot Off-Center) 		A. Single Flap A. Single Disc
(Pivot Off-Center)

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