Description
Flow is blocked bi-directionally between 1 and 2, until pressure at either 1 or 2 rises above the combined pressure of the spring bias, plus pressure at 3. The poppet is balanced between pressures at 1 and 2 with a 1:1 area ratio, and held locked by pressure at 3 in a 2:1 ratio versus either 1 or 2.
¹) Only external seals for 10 valves
