The maximum pressure that will occur in a POC circuit when piloting from the opposite cylinder line is calculated by using:

The maximum pressure that will occur in a POC circuit when piloting from the opposite cylinder line is calculated by using:

• A. Maximum Pressure = LP + (PP * CR)
• B. Maximum Pressure = (PP/LP) + Z
• C. Maximum Pressure = (Z/LP) + PR
• D. Maximum Pressure = [ (LP/PR) + Z ] / [ 1 - (CR/PR) ]

Answer: (A)

In a pilot-operated check circuit, the main-line pressure rises from two sources that combine in the main line: the load pressure the cylinder must overcome (baseline) and the pressure that the pilot signal adds through the circuit’s control ratio. The pilot pressure is transmitted and amplified by CR, so it effectively adds CR times PP to the baseline LP. Therefore, the maximum pressure is LP plus (PP times CR). This reflects the real behavior: the system starts at the load pressure, and when the opposite-cylinder line is used to pilot the check, the pilot signal drives the main line up by the amount CR·PP, until the forces balance. For example, if LP is 100 units, PP is 50 units, and CR is 0.6, the peak pressure becomes 100 + 0.6×50 = 130 units. The other forms would either mix the terms incorrectly or imply operations (like division) that don’t match how pilot pressure adds to the main line pressure in this setup.

In a pilot-operated check circuit, the main-line pressure rises from two sources that combine in the main line: the load pressure the cylinder must overcome (baseline) and the pressure that the pilot signal adds through the circuit’s control ratio. The pilot pressure is transmitted and amplified by CR, so it effectively adds CR times PP to the baseline LP. Therefore, the maximum pressure is LP plus (PP times CR).

This reflects the real behavior: the system starts at the load pressure, and when the opposite-cylinder line is used to pilot the check, the pilot signal drives the main line up by the amount CR·PP, until the forces balance. For example, if LP is 100 units, PP is 50 units, and CR is 0.6, the peak pressure becomes 100 + 0.6×50 = 130 units.

The other forms would either mix the terms incorrectly or imply operations (like division) that don’t match how pilot pressure adds to the main line pressure in this setup.