A three-way poppet valve for directing the flow of a fluid that will permit precise, constant thickness patterns of fluid coating upon a moving surface and cause a minimum of after-drool when the coating process is ceased. The three-way poppet valve assembly is also provided with means to rapidly change...http://www.google.es/patents/US4565217?utm_source=gb-gplus-sharePatente US4565217 - Three-way poppet valve, method and apparatus
