TASK DEFINITION: Translate the given Spanish text to English
PROBLEM: A valve body (26) is received within the seat (20) and comprises a curved surface (28) and a planar surface (30) that extends across the curved surface (28).

SOLUTION: Un cuerpo de valvula (26) es recibido dentro del asiento (20) y comprende una superficie curveada (28) y una superficie plana (30) que se extiende a traves de la superficie curveada (28).

PROBLEM: ID.

SOLUTION: ID.

PROBLEM: A pallet includes an upper and lower deck.

SOLUTION:
Una tarima incluye una cubierta superior e inferior.