Title:
TWO STEP PROPORTIONAL PRESSURE REDUCING VALVE
Document Type and Number:
Japanese Patent JP2017142696
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a two-step proportional pressure-reducing valve with which it is possible to achieve two-step pressure reduction from high pressure to low pressure with a single pressure-reducing valve whereas such operation conventionally is achieved using two pressure-reducing valves.SOLUTION: A two-step proportional pressure-reducing valve 8 comprises a proportional pressure-reducing valve unit 9 and a pressure-reducing valve unit 10. The proportional pressure-reducing valve unit 9 is slidably fitted into a sleeve 27 and arranged coaxially with an electromagnetic valve 13, and has a spool 41 for forming a large diameter sectional area engaged with a tank port 26 and a small diameter sectional area smaller than the large diameter sectional area and formed between first and second discharge ports 24, 25. The pressure-reducing valve unit 10 has an oil passage 57 communicating with a small diameter hole 51 formed in a large diameter hole 56 of a stepped piston 54 fitted into the sleeve 27. One end of the stepped piston 54 is fluid-tightly sealed by a plug 58 that is screwed into the sleeve 27.SELECTED DRAWING: Figure 1
Inventors:
ISHIZU KEIICHI
Application Number:
JP2016024234A
Publication Date:
August 17, 2017
Filing Date:
February 11, 2016
Export Citation:
Assignee:
NACHI FUJIKOSHI CORP
International Classes:
G05D16/10; F16K31/06
Attorney, Agent or Firm:
Akiko Okajima
Kosaku Umemoto
Kosaku Umemoto
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