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Thermoplastic Valves Product Guide & Engineering Specifictions
Quiet Check Valves
Page 817 Suitable for Oil-Free air handling to 25 psi, not for distribution of compressed air or gas Spears
®
Manufacturing Company
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Spears
®
Quiet Check Valve has been designed to provide quiet operation in sump pump or sewage ejector pump
systems typically found in home basements. The back flow of the water column in the discharge pipe can slam
conventional check valves closed, producing a disturbing “thump” when the pump shuts off. The Quiet Check Valve
uses a spring controlled rate of closing to prevent slamming and eliminates the noise.
Each Spears
®
Quiet Check Valve contains both regular socket ends for direct solvent cement connection of the
valve and True Union style end connectors for easy valve removal
or replacement.
Produced in both 1-1/2" and 2" nominal sizes, the 2" size is the mini-
mum recommended for a sewage discharge system (i.e., sewage
ejector pump) while the 1-1/2" size can be used in an efÀ uent system
(i.e., sump pump) discharge line to prevent back À ow of liquid into
sump basin.
Eliminates Noise in Sump Pump and Sewage Ejector
Check Valve Operation
Intake
Discharge
Vent
Quiet Check Valve
(True Union Style)
Ejector
Pump
Typical Application
True Union Socket
Connection
Direct Socket
Connection
Pressure Rating @ 73°F (23°C), Water
Full Flow (open) 150 psi
Back Pressure (closed) 75 psi
Maximum Service Temperature
140°F (60°C)
Temperature/Pressure De-ratings Apply