Start with the decision your project needs next
For a custom hydraulic manifold, a useful purchasing discussion connects three things: what the drawing requires, what the manufacturer will supply and how the delivered block will be accepted. Making these explicit helps prevent a price or sample from being approved against incomplete assumptions.
A schematic or developing design
Share the intended functions, valve list, operating conditions and space constraints. Identify who will complete and approve the manifold design. A schematic can start a discussion; it does not yet define every machining and inspection requirement.
A released drawing for quotation
Provide the matching drawing and model revisions, material condition, interface references, finish and quantities. Highlight the features that matter most to assembly and acceptance so manufacturing questions can be resolved early.
An existing part or repeat order
Identify the approved revision and any known issue, such as cavity fit, roughness, burrs or batch variation. An old sample is useful context, but intended requirements and permitted differences need to be recorded.
Build one enquiry package that engineering and purchasing can both use
Use the checklist below to identify what is ready and what still needs a decision. You can start a conversation with incomplete information; mark open points clearly rather than allowing a missing requirement to become an assumption.
| Item | Information to provide | Why it matters |
|---|---|---|
| Part definition | Current 2D drawing and matching 3D model; revision, units and the document that governs if files conflict. | Prevents quotation and production from following different versions of the same part. |
| Valves and interfaces | Exact valve models, controlled cavity drawings, port and mounting-interface references, plug requirements. | Similar threads do not establish cavity compatibility or the required sealing geometry. |
| Material and condition | Specified grade and standard, product form, supply or heat-treatment condition, hardness where required; rules for proposed alternatives. | A material family or a cross-standard comparison alone is not a complete purchase specification. |
| Critical geometry and finish | Datums, tolerances, hole directions and depths, sealing surfaces and specified roughness; identify deep or compound-angle intersections. | Connects difficult features to machining feasibility and an appropriate verification method. |
| Surface treatment or preservation | Specify black oxide, phosphating, plating or another approved finish where required. Weld-intended Q355B/GB 45 cylinder ends use the specified oil-preserved, uncoated delivery route; include oil compatibility, packaging and storage requirements. | Separates permanent finishes from temporary preservation and defines the condition for dimensional acceptance and the next operation. |
| Acceptance and records | Required checks, report scope, material documentation, sampling or inspection frequency and any separate cleanliness requirement. | Sets the evidence needed for acceptance before the work is priced and scheduled. |
| Supply and quantities | Machined block scope; any plugs, seals, valves or assembly to be discussed separately; sample and batch quantities. | Makes included items and the basis of the unit price clear. |
| Timing and confidentiality | Target delivery, destination, packaging needs, drawing restrictions and NDA requirements. | Allows material, tooling, processing and shipping arrangements to be discussed on the same basis. |
The design engineer determines material and structural suitability for the operating conditions. Working pressure alone does not define a material grade, wall thickness or a universal pressure rating for a custom block. Any proposed material substitution needs approval against the applicable requirements.
Aluminum grade comparisons Ductile iron grade comparisons Stainless steel grade comparisonsCompare what the quotation actually includes
Two quotations are only comparable when the supplied part, production quantity, acceptance requirements and delivery scope match. Ask for unclear assumptions to be resolved before approving the order.
The delivered component
Confirm the exact material and condition, final surface treatment and whether the scope is the machined block or also includes specified purchased parts and assembly. Identify exclusions rather than assuming that everything shown in an assembly drawing is included.
Preparation and verification
Clarify whether dedicated tooling, fixtures, sample preparation, agreed reports or third-party testing affect cost. Agree any project-specific arrangements for tooling and future orders in writing.
Timing and shipment
Confirm the basis of the lead time: drawing approval, material availability, tooling, processing and agreed inspections. Separate manufacturing completion from transport time, and clarify packaging and freight scope.
If cost or timing needs to improve, discuss the requirements that drive it. A change to material, tolerance, treatment or inspection scope must be reviewed and approved; it should not become an undocumented difference between the quote and the drawing.
What affects sample and batch timingDefine acceptance around the actual manifold drawing
Zhongwei’s normal manufacturing checks focus on the specified material and whether the machined component meets the approved drawing. Agree critical characteristics, methods, reporting and inspection frequency for the project; equipment ownership alone does not define the inspection scope.
Material identity and condition
Confirm the grade, applicable condition and the connection between the supplied batch and the material documentation. Specify any additional certificate or hardness requirements before ordering.
Cavity, port and bore geometry
Identify the dimensions, thread-gauge checks, hole diameters, roundness and concentricity where specified, and relevant positional relationships. A passing thread gauge does not establish every cavity dimension.
Sealing surfaces and internal edges
Identify the surfaces with a roughness requirement and the checks for remaining burrs. Deep intersections, angled passages and compound-angle holes deserve an explicit discussion of machining and inspection access.
Pressure and functional testing are not routine acceptance checks for the machined manifold block. If your project requires a separate test, define its purpose, configuration, acceptance criteria and responsibilities before agreeing the scope.
For a quantified component-cleanliness requirement, specify the applicable method, evaluated scope and acceptance limits. Zhongwei can coordinate project-specific SGS testing under an agreed ISO 16232 scope. Cleaning a part is not itself a laboratory cleanliness result.
Reference: ISO 16232:2018 — cleanliness of components and systems describes particulate cleanliness inspection methods and documentation. The required cleanliness level must be defined for the application.
Inspection methods and limitations Third-party cleanliness verification Complex passage machiningAsk for evidence that answers your specific concern
Make a report traceable to the part
Ask how the drawing revision, material identification, batch or sample reference and inspection results relate to the delivered components. Agree the required document set before production.
Match the evidence to the question
A dimensional report addresses its listed features. It does not prove pressure performance, cleanliness or every inaccessible internal surface. A material certificate and a measurement report answer different questions.
Material certificates and dimensional reports can be provided. First-article inspection, CMM reporting and EN 10204 3.1 documentation are agreed by project, rather than treated as an automatic full package for every order. Discuss whether the intended method can reach and measure the critical feature.
For confidential work, agree what can be shared before exchanging restricted records. Public workshop photographs explain our resources and processes; customer drawings and project results need appropriate permission and identification controls.
Documentation and part traceabilityApprove the sample against a recorded requirement
Before the sample is made
Confirm the released revision, material, finish, critical checks and required records. Separate open design decisions from manufacturing questions, and identify who is responsible for approving each.
When the sample is reviewed
Compare results with the agreed requirements. Record fit or assembly feedback from your own evaluation, any nonconformity and its disposition. Approve revised drawings or other controlled changes before the affected production work starts.
Before the production order
Confirm which sample and revision were approved, which changes were incorporated, and the batch quantities and inspection scope. Make the approval basis available for future repeat orders.
Sample acceptance is a reference for production, not a replacement for batch control. Repeat orders still need revision checks, appropriate process and tool controls, inspection and records. Material or process changes that affect the agreed requirements must follow the project’s change-review arrangements.
From sample approval to repeat productionPlan the handover before the shipment arrives
Agree how the parts will be identified, protected and matched to their documents. Include preservation and packaging requirements for sealing faces, openings and the intended transport or storage conditions.
Before dispatch
Confirm the order revision, quantities, agreed records, packaging and delivery details. Resolve missing documents or open acceptance points before they become a receiving delay.
At receiving
Check identification, quantities, visible transport damage and the agreed documentation. Perform incoming checks according to your acceptance plan and preserve the intended clean handling condition.
If an issue is found
Share the part and batch reference, drawing revision, affected feature, measurement method and available photographs. Keep the affected items identifiable so the condition, scope and next action can be reviewed.
Common questions when buying custom hydraulic manifolds
Can I ask for a quotation with only a schematic?
Yes, it can start a technical discussion. Share the functions, valve list and operating conditions, and clarify who will complete and approve the manifold design. A manufacturing quotation needs a sufficiently defined scope; production needs an approved part definition.
Is a 3D model enough for manufacturing?
A model helps define geometry, but may omit tolerances, material condition, roughness, treatment and acceptance requirements. Supply the matching drawing and specifications, and resolve conflicts between files before release.
Which drawing and model formats can I send?
Send DWG, DXF, PDF or JPG drawings and STEP/STP, Parasolid X_T, IGES/IGS or SLDPRT models by email or WhatsApp. Include the revision and units. Send files as documents so drawing detail is preserved; model readability can be checked during the initial review.
Can you choose the material from the working pressure?
Pressure is one input. The design engineer must also consider geometry, wall thickness, fatigue, environment, welding where relevant and material condition. Zhongwei reviews manufacturing and supply requirements; an alternative grade requires approval.
Are valves, plugs and assembly included automatically?
No. Define whether the order covers the machined block, specified plugs or seals, or other agreed items. Valve sourcing, assembly and any separate testing require an explicitly agreed scope.
What documents should I request?
Start with the material and dimensional evidence needed by your acceptance plan. Identify critical features and required report details. Agree first-article, CMM, specific material certificates or third-party reports before quotation and production.
Can I order a sample or a small batch?
Discuss the quantity and purpose of the trial. Material availability, dedicated tooling, setup, finish and inspection requirements affect the practical sample scope, price and timing; these are confirmed for the part.
How should I handle confidential project files?
Contact us to discuss confidentiality and any NDA before sending restricted files. Agree which documents are needed for review, who may receive them and any restrictions on their use.
What should I check before placing a repeat order?
Confirm the approved revision, material and condition, final treatment, accepted changes, quantities, inspection records and delivery requirements. Reference the earlier approval and flag any changed requirement rather than relying on the part number alone.
Tell us what your manifold project needs to get right
Email your drawing package or send it as documents on WhatsApp. Complete manifold drawings are preferred; a schematic can begin the discussion. Include the current revision, material and condition, sample and batch quantities, target delivery and your main concern: cavity fit, sealing-surface quality, complex passages, internal burrs or repeatability.
If a requirement is still undecided, identify it as an open point. We can then discuss the manufacturing questions, information needed for quotation and the next approval step.
Discuss a manifold project