Patent ID: 7793912
Filing Date: 2010-09-14
Classification: F16K,Y10T

Abstract:
1. A fluid pressure actuated poppet valve comprising: a slidable valve that includes a small diameter portion, which has a first outer diameter, and a large diameter portion, which has a second outer diameter, wherein the second outer diameter of the large diameter portion is larger than the first outer diameter of the small diameter portion; and a valve body that slidably receives the slidable valve and includes: when the slidable valve is urged in the valve closing direction toward the valve opening, an inner peripheral wall surface of the valve opening is engageable with an annular engaging part of a seat section provided on an axial end part of the large diameter portion on an opposite axial side of the large diameter portion from the pilot chamber; a diameter of the annular engaging part of the seat section, which is measured along a radially innermost annular boundary of the engaging part of the seat section that is engageable with the inner peripheral wall surface of the valve opening, is larger than the first outer diameter; when the annular engaging part of the seat section is engaged with the inner peripheral wall surface of the valve opening, a radially inner area of the axial end part of the large diameter portion, which borders on and is located radially inward of the radially innermost annular boundary of the engaging part of the seat section, is entirely exposed to the input chamber and is axially opposed to an axial end part of the small diameter portion, which is exposed to the input chamber; a bypass passage that guides an input pressure, which is supplied to the input chamber, to one of the output chamber and the pilot chamber; and a check valve that opens the bypass passage when the input pressure, which is supplied to the input chamber, is increased beyond a pressure in one of the output chamber and the pilot chamber.