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This custom hydraulic valve plunger is precision fabricated by CNC Swiss Turning equipment as an experienced OEM custom manufacturer, adopting high-quality 304 stainless steel as raw material. The part features multi-step stepped outer diameter and concentric stepped through inner hole with smooth seamless outer cylindrical surface to ensure tight sealing during fluid switching. After full CNC Swiss Turning forming, all finished parts go through strict degreasing & alkaline cleaning to remove residual machining oil, followed by chemical passivation treatment to boost stainless steel’s anti-rust & corrosion resistance. Our factory delivers flexible custom service to revise overall length, outer dimension, inner bore diameter and surface treatment solution based on global clients’ technical drawings or physical samples for diverse industrial fluid control valve assembly projects.
Technical Specification
Specification
Value
Product Name
Pneumatic Hydraulic Valve Plunger
Raw Material
304 Stainless Steel
Standard Overall Length
11mm
Outer Diameter Spec
Max OD 10mm, Min OD 4.6mm
Inner Hole
Full stepped through bore, min inner bore Ø3.4mm, max inner bore Ø8.1mm
Machining Process
Precision CNC Swiss Turning
Surface Treatment
Degreasing & Ultrasonic Cleaning + Stainless Steel Chemical Passivation
Dimensional Tolerance
±0.015mm for critical fit dimension per custom requirement
Surface Finish
Smooth as-machined outer surface without knurling
Applications
Industrial automated pneumatic solenoid valve core & flow control plug parts
Hydraulic oil pressure control valve plunger for small hydraulic power unit assemblies
Pneumatic compression equipment & air compressor directional control valve components
Automation packaging machinery fluid regulating valve spare parts
Medical fluid delivery equipment & small industrial pipeline check valve inner core
Custom Services
As a professional OEM custom manufacturer, our all-round custom service covers below items:
OEM dimensional customization: Modify total length, stepped outer/inner bore sizes according to customer drawings or physical samples
Material alternative customization: Replace 304 stainless with 316 stainless, carbon steel or alloy steel upon working fluid environment demand
Surface treatment adjustment: Swap passivation to electropolishing, bright polishing or other anti-corrosion finishes via custom service
Structure customization: Change through bore into blind hole structure or adjust step layout as customer design
Small batch trial order & large volume mass production support for global importers and equipment manufacturers.
Product Advantages
High-precision CNC Swiss Turning with ±0.015mm tolerance eliminates poor concentricity issue, preventing fluid leakage caused by loose fit during plunger reciprocating movement
304 stainless steel + passivation finish solves rust & corrosion failure under long-term humid/oily hydraulic working medium, extending valve service lifespan
Smooth seamless outer surface avoids scratch damage to valve housing inner wall during repeated sliding, reducing abnormal stuck plunger failure
Accurate stepped inner through hole ensures stable fluid flow rate, solving inconsistent flow control trouble of finished valves
Uniform post-process degreasing cleaning removes residual machining oil, preventing medium contamination caused by leftover cutting fluid inside hydraulic pipeline.
Quality Control
Incoming raw material inspection for 304 stainless steel chemical composition and hardness before production start
In-process periodic dimensional testing during CNC Swiss Turning to control critical tolerance within ±0.015mm
Concentricity inspection for stepped inner & outer bore via precision measuring instrument after machining
Final appearance check to confirm full degreasing and complete passivation coverage without incomplete processing
Random sample anti-corrosion spot test before shipment for all OEM custom valve plunger orders.
FAQ
Q: Can your custom service modify dimension and inner hole structure for this stainless steel valve plunger?
A: Yes, as a custom manufacturer, we fully support OEM customization based on your drawings or samples.
Q: What’s your flexible MOQ for custom hydraulic valve core production?
A: Small sample trial order is acceptable, flexible minimum quantity for bulk OEM production.
Q: Can I change surface finish instead of standard passivation treatment?
A: Absolutely, we provide electropolishing and other surface options through our custom service.
Q: How long is production lead time after custom drawing confirmation?
A: Standard production cycle is 7~14 working days upon your technical specification approval.
