Jeffrey A. Perkins;Joseph G. Schroeder;Stephen G. Nemethy;Terry John Thompson;Terrence M. Fulkerson
发明人:
Terrence M. Fulkerson,Stephen G. Nemethy,Terry John Thompson,Jeffrey A. Perkins,Joseph G. Schroeder
申请号：
US13444321
公开号：
US08491227B2
申请日:
2012.04.11
申请国别(地区):
US
年份:
2013
代理人:
摘要：
A pump for particulate material includes a pump chamber wherein material flows into the pump chamber under negative pressure and flows out of the pump chamber under positive pressure. A plurality of pinch valves are provided to control flow of material into and out of the pump chamber. The pinch valves are operated independent of each other and of the pump cycle rate. A modular design of the pump is provided. A pump control feature is provided for air flow rate control during positive and negative pressure conditions.
