THROTTLE VALVE

WIPO Patent Application WO/2021/012751

A1

Disclosed is a throttle valve, comprising: a valve pipe (10), wherein the valve pipe (10) is provided with a fluid channel; a valve seat (20) arranged in the fluid channel of the valve pipe (10), wherein the valve seat (20) is provided with a first channel, a throttling channel and a second channel, and the first channel is in communication with the second channel by means of the throttling channel; a valve needle (30) movably arranged in the valve seat (20), wherein the valve needle (30) comprises a body portion (31) and a protruding portion (32), the body portion (31) is arranged in the second channel, and the protruding portion (32) is used for controlling the opening and closing of the throttling channel; and a gradually changing spring (40), wherein the gradually changing spring (40) is arranged in the second channel, one end of the gradually changing spring (40) abuts against the valve needle (30), and the other end of the gradually changing spring (40) abuts against at least part of the valve seat (20) so as to enable the gradually changing spring (40) to adjust the liquid flow in the throttling channel according to the liquid flow in the first channel. The technical problem of the flow of a throttle valve being inconvenient to adjust in the prior art can thus be solved.

SONG ZHIGUO (CN)
FENG ZHONGBO (CN)

PCT/CN2020/089880

January 28, 2021

May 12, 2020

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ZHEJIANG DUNAN ARTIFICIAL ENV CO LTD (CN)

F16K1/32

CN209012449U	2019-06-21
CN210637523U	2020-05-29
CN105972233A	2016-09-28
CN204436923U	2015-07-01
CN205745625U	2016-11-30
JP2017155848A	2017-09-07
JP2016156397A	2016-09-01

KANGXIN PARTNERS, P.C. (CN)

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