Pressure relief valve assembly

A pressure relief valve assembly comprising:

• a valve housing;
• a primary pressure relief valve having a valve ball and a valve spring within the valve housing, the valve spring biasing the valve ball in a first direction into a valve seat to prevent the passage of fluid from a fluid line through the valve;
• wherein the spring force is selected such that a fluid force above a predetermined set point acting against the ball in a second direction opposite the first direction causes the ball to move out of the valve seat against the spring force to allow fluid to flow from the fluid line through the valve seat and through the valve;
• wherein fluid is provided inside the housing around the valve spring;
• and
• a secondary valve positioned in the housing relative to the primary pressure relief valve to retain the fluid around the valve spring of the primary pressure relief valve at a fluid force below the predetermined set point.