flapper

n.

（打苍蝇等的）拍子，蝇拍；

flapper valve片状阀；铰链阀

FLAPPER OPERATING SYSTEM WITHOUT A FLOW TUBE
Suppression of Squeal Noise Excited by the Pressure Pulsation from the Flapper-Nozzle Valve inside a Hydraulic Energy System
A characterisation of logistics networks for product recovery
A facility location allocation model for reusing carpet materials
Towards consistent performance management systems
Reverse Logistics: A Review of Case Studies
Perceptual skills of children with developmental coordination disorder.
Product recovery in stochastic remanufacturing systems with multiple reuse options ☆
Optimal core acquisition and remanufacturing policies under uncertain core quality fractions
Fine motor skills and effects of methylphenidate in children with attention-deficit–hyperactivity disorder and developmental coordi...