Valves and valve actuation – Fluid actuated or retarded – Pilot or servo type motor
Patent
1997-04-07
1999-08-17
Lee, Kevin
Valves and valve actuation
Fluid actuated or retarded
Pilot or servo type motor
251903, F16K 3102
Patent
active
059381701
ABSTRACT:
A pilot-operated proportional control electromagnetic relief valve has a needle guide portion snugly fitted around the outer surface of a needle. The needle guide portion guides vertical movement of the needle, and is located at the center of a stopper so as to be coaxial with the stopper. A cylindrical inner wall portion of the stopper is so bored in the lower part of the adapter as to be coaxial with the needle guide portion. A cylindrical outer wall portion to be snugly fitted in the cylindrical inner positioning wall portion is so formed around the outer surface of a seat as to be coaxial with the seat portion. The outer circumferential surface of the needle is snugly fitted in the needle guide portion of the adapter so that the needle guide portion guides the axial travel of the needle, and the cylindrical inner wall portion of the adapter and the cylindrical outer wall portion of the seat are snugly fitted together. The needle can therefore be properly seated without the danger of the needle being in off-center contact with the seat portion.
REFERENCES:
patent: 3477466 (1969-11-01), Sturm
patent: 4624441 (1986-11-01), Kreitchman et al.
patent: 5232195 (1993-08-01), Torrielli
patent: 5660368 (1997-08-01), De Matthaeis et al.
Shimada Yoshiyuki
Yoshino Tetsuya
Lee Kevin
Shin Caterpiller Mitsubishi Co., Ltd.
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