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User manual
P/N 3-9008-556
Closed position
The normally closed solenoid is closed. The normally open solenoid is open. Y-port (P3) to
Z-port (p2) is closed. X-port (P1) and Y-port (P3) pressures are balanced. The main valve
spring being the differential force, closes the position and keeps it seated. (See below.)
Figure 1-1: Closed position
Open - control position
The normally closed solenoid is closed. The normally open solenoid is closed. Y-port (P3)
to Z-port (P2) is closed. X-port (P1) to Y-port (P3) is closed. The product cannot flow to or
from the top of the piston. The piston is hydraulically locked in position until the
electronics preset commands the valve to open or close as required to maintain the
desired high flow rate, or low flow rate. (See below.)
User manual
Introduction
October 2019
13
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