Parker Commercial DVA35 Hydraulic Control Valve S/N 115244813

Parker Commercial Hydraulics DVA35 Directional Control Valve (S/N: 115244813)

The Parker Commercial Intertech DVA35 Series (Unit S/N: 115244813) is a heavy-duty, stackable sectional directional control valve engineered for open-center, constant-flow (CF) fluid power circuits. Cast from high-tensile, close-grained gray iron, this workhorse directional valve is widely utilized in high-vibration, high-duty-cycle industrial, offshore, and marine environments.

The DVA35 platform features low-friction precision-metering spools designed to feather high loads smoothly, minimizing thermal buildup and backpressure spikes during directional transitions. Unit S/N 115244813 has undergone dimensional clearance verification, internal pilot inspection, and hydro-static shell integrity screening to ensure zero cross-port bypass and immediate operational readiness.

Model Details:

• Manufacturer: Parker Hannifin (Commercial Hydraulics / Commercial Intertech Division)
• Base Model Series: DVA35 (Cast Iron Construction)
• Serialized Assembly ID (S/N): 115244813
• Manufacturer Part Code / Family: DVA35-A880 series inlet with modular work section stack
• Architecture Type: Segmental / Stackable sectional design clamped via high-tensile tie-bolts
• Circuit Compatibility: Open-Center standard (convertible to Closed-Center or Power Beyond via port sleeve adapter)

Technical Details:

Cross-References & Interchangeability

• Parker / Commercial Intertech Casting Families: DVA35, VA35, DVG35 (cast graphite equivalent)
• Commercial Part Numbers (Inlet & Work Sections): 348-9175-005 (Inlet DVA35-A880), 348-9172-003 (DVA35-DA8 Cylinder Spool), 348-9172-006 (DVA35-MA8 Motor Spool), 348-9176-002 (Tank Return DVA35-TR99)
• Seal Kit Reference: Parker Commercial Intertech SK-DVA35 / MSG14-2005-M1
• Interchangeable Valve Lines: Permco V35 series, Tyrone/Dana sectional valves, Gresen 35-series (footprint check required).

Industrial & Offshore Applications

• Marine Anchor Handling Winches & Tug Mooring Systems
• Offshore Davit Launchers and Deck Cargo Cranes
• Mining and Heavy Earthmoving Auxiliary Hydraulic Drives
• Dredging Spud Hoists and Cutterhead Positioning Arms
• Large Refuse Trucks, Roll-off Compactors, and Heavy Municipal Loaders
• Drill Rig Mast Raising and Pipe Handling Manipulators

Frequently Asked Questions

What is the primary operational difference between Parker VA35 and VG35 valves?

The VA35 (including DVA35) is cast from Class 35/40 dense gray iron and rated for working pressures up to 2,500 PSI (172 bar). The VG35 variant uses compacted graphite ductile iron, which raises the continuous maximum pressure rating to 3,500 PSI (241 bar). Both units share identical mounting footprints and port geometries.

Can this DVA35 valve be converted from an Open-Center to a Closed-Center hydraulic system?

Yes. The DVA35 can be converted using a field conversion plug installed in the open-center core passage within the outlet cover. This blocks the bypass gallery to tank, allowing the valve to operate on variable-displacement, load-sensing/pressure-compensated pump systems.

What oil filtration standards should be maintained for this valve assembly?

To prevent premature spool land erosion and sticking, fluid cleanliness should meet or exceed ISO 4406 Cleanliness Code 19/17/14 (nominal 10-micron return line filtration, Beta ratio ≥ 200). In offshore marine systems, routine particle and water testing is recommended to keep water saturation below 0.05%.

Why is spool feathering sticking after the hydraulic oil warms up?

Spool binding under heat almost always stems from two causes: either the structural tie-bolts were torqued beyond 35 ft-lbs (distorting the bore as thermal expansion occurs), or the valve body is mounted against an uneven, twisted mounting deck plate. Always mount the valve on a three-point isolation bracket or use machined shims beneath mounting feet.