| 摘要 |
PCT No. PCT/SE94/01193 Sec. 371 Date Aug. 27, 1996 Sec. 102(e) Date Aug. 27, 1996 PCT Filed Dec. 12, 1994 PCT Pub. No. WO95/17623 PCT Pub. Date Jun. 29, 1995A high-pressure valve comprising a piston whose upper surface is acted upon intermittently by a medium, such as air, to control vertical movement of the piston, the valve including a connection of the piston to a needle valve. The needle valve coacts with a valve seat and communicates with the inlet to a liquid delivery line through which liquid is delivered to the needle valve via a high-pressure pump and leaves through a nozzle orifice. Also provided is a rotatable device for mechanically forcing the piston to a lower position in which the needle valve is brought into abutment with the valve seat. |
