Overview
ISO 6263:2013 - "Hydraulic fluid power - Compensated flow-control valves - Mounting surfaces" defines the dimensions and related data for surfaces on which hydraulic compensated flow-control valves are mounted to ensure mechanical interchangeability. It covers mounting surfaces and port layouts that represent current practice for industrial hydraulic equipment (subplates, manifold blocks and valve assemblies).
Key topics and technical requirements
- Scope and purpose: Establishes standard mounting-surface geometry so valves from different manufacturers are interchangeable.
- Dimensions and port sizes: Specific mounting patterns and tables are provided for valves with main port diameters of 4.5 mm, 7.5 mm, 14.7 mm, 17.5 mm and 23.4 mm, with figures and dimension tables for each code variant.
- Tolerances and surface quality:
- Surface flatness: 0.01 mm over 100 mm
- Locating pin hole tolerance: H12
- Position tolerances (relative to origin): pin holes ±0.1 mm; screw holes ±0.1 mm; port holes ±0.2 mm
- Surface roughness references to ISO 3601‑2
- Fixing hole and thread guidance:
- Minimum thread depth: 1.5 × D
- Recommended full thread depth: 2D + 6 mm
- Recommended engagement for ferrous mountings: 1.25D
- Maximum corner radius of mounting area equals fixing screw thread diameter
- Blind hole depth for locating pin: minimum 4 mm
- Port marking and coding: Port symbols and marking tables are provided; code system per ISO 5783 and graphical symbols per ISO 1219‑1.
- Modular stack valves: For modular stack valves the standard defers mounting surfaces and port marking to ISO 4401.
- Working pressure: Maximum working pressure for subplates and manifold blocks is supplied by the supplier (noted on figures).
Applications and practical value
- Ensures interchangeability of compensated flow-control valves across manufacturers.
- Used in the design and machining of subplates, manifold blocks, valve mounting faces and hydraulic assemblies for industrial equipment.
- Critical for OEMs, hydraulic system designers, machine builders, maintenance engineers and procurement teams who need consistent valve-to-mount interfaces.
- Useful for product catalogs, test reports and sales literature - the standard even supplies a recommended identification statement for compliance.
Who should use this standard
- Valve manufacturers and designers
- OEMs and machine builders specifying hydraulic valves
- Hydraulic system integrators and maintenance teams
- Technical authors producing catalogs, datasheets and installation guides
Related standards
Recommended identification for literature: “Mounting surface dimensions conform to ISO 6263:2013, Hydraulic fluid power - Compensated flow-control valves - Mounting surfaces.”
