Reversing valve for a compressed air membrane pump
AssigneeALMATEC Maschinenbau GmbH
InventorDIRK BUDDE
Life of this patent
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Abstract
A reversing valve for a compressed air membrane pump in which an equilibrium state of the main piston in the neutral position, leading to stoppage of the pump, is prevented by disposing the main system piston and the pilot system piston immediately adjacent to one another.
Claims7
A pneumatic reversing system for a pressure-driven membrane pump which pressurises the membrane on alternate sides with compressed air through a main system piston which oscillates essentially between two positions and is controlled by a pilot system, wherein the main system piston (2) and the pilot system piston (1) are disposed directly adjacent to one another.
A pneumatic reversing system for a pressure-driven membrane pump which pressurises the membrane on alternate sides with compressed air through a main system piston which oscillates essentially between two positions and is controlled by a pilot system, wherein the reversing function of the pilot system is performed by means of a component (3) which is largely compulsorily coupled with the membrane movement, said component being provided with ducts (11, 12, 13) which on longitudinal displacement of the component (3) effect a diversion of the compressed air followed by displacement of the main system piston (2).
A pneumatic pump having a reversing system, wherein the following pairs of materials are used as counter-running partners:
- Piston ring:
- ultra-high-molecular weight low pressure polyethylene (PE UHMW (1000))
- Running counterpart:
- polyethylene terephthalate (PETP),
- polybutylene terephthalate (PBTP)
- or
- Piston ring:
- polytetrafluoroethylene with 15% polyphenylene sulfide (PTFE+15 PPS)
- Running counterpart:
- polyethylene terephthalate (PETP),
- polybutylene terephthalate (PBTP),
- polyarylether ether ketone (PEEK),
- polyarylether ketone (PEK).
Dependencies are inferred from the claim text.