Double check valve assembly

Plumbing · Distribution Piping In the House · printed page 268 (PDF page 269)

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Book index entries

Double Check Valve Assembly – Plumbing Plumbing – Double Check Valve Assembly Supply Plumbing – In-house

Text in the illustration

test port test port test port test port test port test port test port test port
test port
normal operation
water
water flow
upstream valve
downstream valve
check valve
(open)
backflow
condition
(closed)
note:
mechanism
simplified for
clarity

Generated explanation

Two cutaway views depict a double check valve assembly with upstream and downstream handwheel-operated valves, two spring-loaded check valves in series, and four test ports. The upper view shows normal operation, with both check valves open and water flowing from left to right. The lower view shows a backflow condition, with reverse flow entering from the right and both check valves closed to prevent upstream backflow. A note states that the mechanism is simplified for clarity.

Components

double check valve assembly upstream shutoff valve downstream shutoff valve spring-loaded check valves test ports valve handwheels water supply piping

Related illustrations

1548.5

Dual check valve assembly

· p. 267

Two sectional views show a dual check valve assembly with two spring-loaded check valves arranged in series inside a common housing. In the upper view, normal water flow travels from left to right with both check valves