Durable valves for displacement pumps

A valve for a displacement pump, the valve comprising:

• a valve seat having an outer surface a central passage defined by an inner surface, and a seating surface extending radially between the inner surface and the outer surface;
• a valve body having an annular strikeface and defining an annular receptacle;
• and
• an annular seal received in the receptacle of the valve body and having a first end and a longitudinally opposed second end, the seal comprising an annular exterior surface that includes a contact surface positioned along the second end of the annular seal;
• wherein the contact surface of the annular seal comprises an annular radially inner frustoconical surface extending radially outwards from an inner diameter of the contact surface at an incline directed towards the first end of the annular seal, and an annular radially outer convex surface that extends radially to an outer diameter of the contact surface to define the outer diameter of the contact surface;
• wherein the seal has an integrated cumulative displacement ratio of 0.31 or less;
• wherein the valve comprises an open state in which the contact surface of the annular seal is entirely spaced from the valve seat and a closed state in which the contact surface is in contact with the seating surface of the valve seat, and wherein the convex surface is the radially outermost portion of the annular seal that contacts the valve seat when the valve is in the closed state.

A valve for a displacement pump, the valve comprising:

• a valve seat having an outer surface, a central passage defined by an inner surface, and a seating surface extending radially between the inner surface and the outer surface;
• a valve body having an annular strikeface and defining an annular receptacle;
• and
• an annular seal received in the receptacle of the valve body and having a longitudinal axis, a first end, and a longitudinally opposed second end, the seal comprising an annular exterior surface that includes a radially outer surface extending between the first end and the second end, and a contact surface positioned along the second end of the annular seal;
• wherein the contact surface of the seal extends between an inner diameter and an outer diameter from which the radially outer surface directly extends in a direction substantially parallel with the longitudinal axis and which comprises an annular radially inner frustoconical surface extending radially outwards from the inner diameter of the contact surface at an incline directed towards the first end of the annular seal, a radially outer annular convex surface extending radially outwards to the outer diameter of the contact surface to define the outer diameter of the contact surface, and an annular concave interface positioned between the frustoconical surface and the radially outer convex surface;
• wherein the valve comprises an open state in which the contact surface of the annular seal is entirely spaced from the valve seat and a closed state in which the contact surface is in contact with the seating surface of the valve seat, and wherein the convex surface is the radially outermost portion of the annular seal that contacts the valve seat when the valve is in the closed state.