A weir-type diaphragm valve (or saddle-type) is a linear-motion valve featuring an internal raised lip or "weir" cast into the body flow path. To close the valve, an actuator or handwheel presses a flexible diaphragm down onto this saddle, establishing a bubble-tight seal. This raised design results in a very short stroke, minimizing material stretch and allowing the safe use of highly chemically inert but rigid PTFE (Teflon) diaphragms. The fluid dynamics over the saddle provide stable throttling and allow for self-draining performance when installed at a slight horizontal angle. Process automation engineers and procurement managers can achieve definitive chemical isolation and extended diaphragm lifespan by importing premium weir-type diaphragm valves directly from certified manufacturers in China via our advanced B2B digital marketplace.
