Pilot-operated solenoid valve

Patent metadata

Field	Value
Publication number	US-10006558-B2
Application number	US-201615136342-A
Country	US
Kind code	B2
Filing date	Apr 22, 2016
Priority date	May 26, 2015
Publication date	Jun 26, 2018
Grant date	Jun 26, 2018

Abstract

A pilot-operated solenoid valve includes a pilot valve unit having a fixed core and a movable core, and a passage block formed with a valve seat which a diaphragm valve element comes into contact or separates from. The pilot valve unit includes an NO port, a common port, and an NC port. The passage block is formed with an inlet port, an outlet port, a back chamber, an NO passage, a common passage, an NC passage an external exhaust passage, and an internal exhaust passage. The solenoid valve further includes a first or second metal ball to seal the external exhaust passage or the internal exhaust passage. The passage block includes a flat cover formed with a communication passage for communicating the recess with the common port.

First claim

What is claimed is:

1. A pilot-operated solenoid valve provided with a pilot valve unit having a fixed core and a movable core, and a passage block formed with a valve seat which a valve element comes into contact or separates from,
wherein the valve element is a diaphragm valve element,
the pilot valve unit includes an NO port, a common port, and an NC port,
the passage block is formed with an inlet port, an outlet port, a back chamber defined by the diaphragm valve element, an NO passage for communicating the inlet port with the NO port, a common passage for communicating the back chamber with the common port, an NC passage communicated with the NC port, an external exhaust passage for communicating the NC passage with atmosphere, and an internal exhaust passage for communicating the outlet port with the NC passage,
the pilot-operated solenoid valve further includes a sealing member to seal one of the external exhaust passage and the internal exhaust passage,
the passage block has a rectangular parallelepiped shape having a pair of wide opposite surfaces and four side surfaces surrounding the wide opposite surfaces, the four side surfaces including a first surface attached thereon with the pilot valve unit and a second surface formed with at least one of the inlet port and the outlet port,
the diaphragm valve element is placed in parallel with the pair of wide opposite surfaces,
the passage block includes a block body and a flat cover having a flat plate shape, the flat cover including a recess forming the back chamber, and
the flat cover is formed with a flat-cover communication passage for communicating the recess with the common port,
the external exhaust passage and the internal exhaust passage are coaxially provided,
the external exhaust passage has a passage diameter larger than the internal exhaust passage,
the external exhaust passage and the internal exhaust passage configured to enable:
(1) the sealing member to be press-fitted in the external exhaust passage when the sealing member is a first sealing member, and
(2) the sealing member, having an insertable size in the external exhaust passage, to be press-fitted in the internal exhaust passage when the sealing member is a second sealing member, where the first sealing member is sized to be larger than the second sealing member.

2. The pilot-operated solenoid valve according to claim 1 , wherein the sealing member has at least one of a spherical shape and a columnar shape.

3. The pilot-operated solenoid valve according to claim 2 , wherein the sealing member is fixed to the passage block by at least one of welding and bonding.

4. The pilot-operated solenoid valve according to claim 3 , wherein the passage block is configured such that the external exhaust passage and the internal exhaust passage are formed on a first section, and the NC passage is formed on a second section parallel to the first section, and
the passage block is formed with a bypass passage for placing the NC passage in communication with the external exhaust passage and the internal exhaust passage.

5. The pilot-operated solenoid valve according to claim 2 , wherein the passage block is configured such that the external exhaust passage and the internal exhaust passage are formed on a first section, and the NC passage is formed on a second section parallel to the first section, and
the passage block is formed with a bypass passage for placing the NC passage in communication with the external exhaust passage and the internal exhaust passage.

6. The pilot-operated solenoid valve according to claim 1 , wherein the sealing member is fixed to the passage block by at least one of welding and bonding.

7. The pilot-operated solenoid valve according to claim 6 , wherein the passage block is configured such that the external exhaust passage and the internal exhaust passage are formed on a first section, and the NC passage is formed on a second section parallel to the first section, and
the passage block is formed with a bypass passage for placing the NC passage in communication with the external exhaust passage and the internal exhaust passage.

8. The pilot-operated solenoid valve according to claim 1 , wherein the passage block is configured such that the external exhaust passage and the internal exhaust passage are formed on a first section, and the NC passage is formed on a second section parallel to the first section, and
the passage block is formed with a bypass passage for placing the NC passage in communication with the external exhaust passage and the internal exhaust passage.

Assignees

• Ckd Corp

Inventors

• Suematsu Osamu

Classifications

• F16K31/402

  acting on a diaphragm · CPC title

• F16K27/0236

  Diaphragm cut-off apparatus · CPC title

• F16K31/42

  by means of electrically-actuated members in the supply or discharge conduits of the fluid motor (F16K31/40 takes precedence) · CPC title

• F16K31/0641 Primary

  the valve member being a diaphragm · CPC title