Relief valve device
AssigneeKosmek Ltd.
InventorAkira Arisato
Life of this patent
Estimating the term…
Abstract
A first relief valve chamber (3) of a main relief valve (10) and a second relief valve chamber (7) of an auxiliary relief valve (11) are provided in series in a valve case 1. The first relief valve chamber (3) includes a valve seat chamber (4) at the right and a valve chamber (5) at the left. A first valve member (30) in the valve chamber (5) is biased toward a valve seat member (18) in the valve seat chamber (4) by a first relief spring (40). A second valve member (48) in the second relief valve chamber (7) is biased toward a second valve seat (47) by a second relief spring (50).
Claims5
A relief valve device comprising a main relief valve (10) and an auxiliary relief valve (11), wherein a first relief valve chamber (3) of the main relief valve (10) and a second relief valve chamber (7) of the auxiliary relief valve (11) are communicatively connected in order in a valve case (1),
- the main relief valve (10) comprises:
- a valve seat member (18) hermetically provided in the first relief valve chamber (3) to be movable;
- a first valve member (30) inserted into the first relief valve chamber (3) so as to be movable, and biased toward the valve seat member (18) by a first biasing member (40) provided in the valve case (1);
- an annular first valve surface (35) provided on an end face of the first valve member (30);
- a first valve seat (25) provided so as to face the first valve surface (35), the first valve seat (25) being formed by an elastic member attached to an annular groove (23) formed at an end portion of the valve seat member (18);
- and
- a through hole (19) formed in the valve seat member (18), the through hole (19) allowing a valve seat chamber (4) which constitutes the first relief valve chamber (3) and is on the inlet side to always communicate with a space sealed by the first valve seat (25) and the first valve surface (35),
- the auxiliary relief valve (11) comprises:
- a second valve member (48) inserted into the second relief valve chamber (7) so as to be movable;
- a second valve surface (49) provided on the second valve member (48);
- a second valve seat (47) provided in the second relief valve chamber (7) so as to face the second valve surface (49);
- and
- a second biasing member (50) provided in the valve case (1) so as to bias the second valve surface (49) toward the second valve seat (47), and
- a relief pressure of the auxiliary relief valve (11) set by the second biasing member (50) is lower than a relief pressure of the main relief valve (10) set by the first biasing member (40);
- wherein pressure fluid supplied to the main relief valve (10) is discharged after passing through the valve seat chamber (4), the through hole (19), a gap between the first valve seat (25) and the first valve surface (35) of the main relief valve (10), and a gap between the second valve seat (47) and the second valve surface (49) of the auxiliary relief valve (11) in this order.
Dependencies are inferred from the claim text.