Eaton Vickers® SystemStak™ Valves

ISO 4401 -05 size, 315 bar (4500 psi) and 120 l/min (32 USgpm) maximum ratings Pressure relief and reducing, sequence, counterbalance, and flow control functions

General Description

Vickers SystemStak^TM valves make compact hydraulic systems in which modular valves are “sandwich” mounted between a directional valve and a standard mounting surface. Compact

design improves system response by elimination of external fluid conductors,thereby resulting in elimination of resonant sounds which are noisy and lead to leakage. The design of these valves is well proven and offers opportunities for achieving small control assemblies, especially when the valves are used with multi-station manifolds.

Three mounting surfaces are available for interfacing with directional valves and are coded “5”, “5N”, or “5P” in the model numbers of Vickers SystemStak valves. The “5” interface accepts

Vickers DG4S4 directional valves and other directional valves with a standard ISO 4401-05, NFPA-D05, ANSI/B93.7M size D05 or CETOP-5 port pattern. “5N”and “5P” NFPA-D05 interfaces accept  the Vickers directional valves listed on page 38.

Each valve “stak” can be configured to provide the specific combination of functions required to meet the system’s needs.

SystemStak valves are divided into two groups:

1. Valves acting in the pressure and/or tank lines (“P” and/or “T”)

DGMC-------------------Relief valve

DGMDC-----------------Direct check

DGMFN-----------------Flow control

DGMR1-----------------Sequence valve

DGMX2------------------Pressure reducing

The general rule for this group is that the DGMC relief valve be placed nearest the subplate or manifold.

The DGMDC direct check valve should be placed nearest the directional control valve.

The DGMR1 sequence valve should be the farthest valve from the directional valve. The DGMR1 must be mounted directly to a subplate or manifold with a drain port, to externally drain the DGMR1 at the mounting face.

2. Valves acting in the service lines (“A”and/or“B”)

DGMC-----------------Relief valve

DGMC2---------------Dual relief valve

DGMDC --------------Direct check

DGMPC --------------Pilot operated check

DGMFN --------------Flow control

DGMR-----------------Counterbalance

The general rule for this group is that the DGMC system relief valve be the farthest valve from the directional valve.

When using a DGMPC with a DGMFN (meter-out), the DGMPC should be nearest the directional valve.

Features and Benefits

lReduced space requirements 

Stackable SystemStak valves, used with ISO 4401-05, CETOP 5 (NFPA-D05) directional controls,provide compact cost-effective control of actuator direction, speed and force.

lReduced installed cost 

SystemStak valves eliminate all intervalve piping and connections,thereby reducing the number of potential leakage points. Installed cost is less than when using conventional subplate- or line-mounted valves.

lVersatile & easy to install 

SystemStak valves have all the internal passages necessary to serve the directional valve mounted above them. Any directional valve with a standard ISO 4401-05, NFPA-D05,ANSI/B93.7M size D05 or CETOP-5 port pattern can be used with ISO 4401-05 SystemStak valves.

Vickers bolt-extender kits simplify valve installation by permitting each valve body to be separately and quickly installed, and correctly torqued down. The kits also allow the directional valve to be removed for service or replacement without disturbing the stack.

lRugged & reliable 

Internal working parts are produced from hardened steel, and reside in a continuous-cast ductile (spheroidal graphite) iron body. Excellent reliability is ensured, even in high pressure applications. Working parts are serviceable without removing valves from the stack.