Figure 3-22.Hydraulic pressure regulator.
Figure 3-23.Spring-loaded pressure-reducing valve.
movable element have equal areas.
This type of
movable element is frequently referred to as a plunger.
The most common ram-type cylinders are the single-
(fig. 3-28) and double-acting (fig. 3-29).
The ram-type actuator is primarily used to push,
rather than pull. Some applications require simply a
1. Adjustment screw
6. Pilot passage
2. Internal drain
7. Check valve
8. Discharge outlet
or reverse free
5. Pressure inlet or
reverse free flow
Figure 3-24.Counterbalance valve.
flat surface on the external part of the ram for pushing
or lifting the unit to be operated. Other applications
require some mechanical means of attachment, such as
a clevis or eyebolt. The design of ram-type cylinders
varies in many other respects to satisfy the
requirements of different applications.