Bottom Valve

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Piston, bottom valve, rod guide made by powder metallurgy technology.Using fe-c-cu powder, the mould is pressed, sintered and machined.

Bottom Valve Features:

The piston and the bottom valve mainly provide damping for the shock absorber ,rod guide mainly guide for the movement of piston rod.

Technological process: mixing powder – forming – sintering – cleaning -Steam treatment – Bending-Press bushing-Appearance inspection, packing

Mixing powder: Fe – C – Cu powder by high density sieve to remove impurities, automatic blending machine 360 ° rotating more than 4 hours, make the material mix evenly

Molding: precision mould with automatic CNC hydraulic press to ensure the density of all parts meet the process requirements after pressing.

Sintering: the product is controlled by the net belt type sintering furnace, which ensures the mechanical properties and hardness of the products to meet the technical requirements.

Oil immersion: place the product in a high pressure vessel so that the oil can fully penetrate into the product’s pores and avoid the rust of the later cycle.

Plastic: precision mould with full automatic CNC hydraulic press, the product density and mechanical properties are further improved after pressing, and the dimensions meet the requirements of the drawing.

Machining: finish the hole, groove and other details of the product.

Cleaning: the mesh belt adopts ultrasonic cleaning machine to remove impurities and iron filings.

Steam treatment: the product is treated by steam in the electric furnace, which improves the mechanical properties of the product, and the surface oxidation layer helps to prevent rust.

Packing: the piston is covered by a fully automatic numerical control machine covering the PTFE lubrication belt.

Press bushing: pressed into DU bushing.

Appearance inspection, packing.

Bottom Valve Specification


Product Details
Product Name Powder Metal Sintered Part for Shock Absorber
Material (MPIF 35) FC-0205 (DIN 30910-4) Sint C10, Fe, Balance, Cu 1.5-3.9%, C 0.3-0.6%
Density 6.4-6.9 g/cm3 after steam oxidation
Hardness 60-115 HRB, loading 1 kN, diameter of ball 1/16″
Surface Treatment Steam oxidation, 2 hours, Fe3O4: 0.004-0.005mm, degree of oxidation 2-4%
Unspecified Tolerance ISO 2768 – m / H14, h14, +- IT14/2
Apperance No crumbling, cracks, exfoliation, voids, looseness, metal pitting and other defects
Process Flow Powder mixing – Forming – Sintering – Oil impregnation – Sizing –
Ultrasonic cleaning – Steam oxidation – Oil impregnation – Final
inspection – (+ DP4 bushing / +PTFE band) Packing
Application For automobile, motorcycle and bicycle shock absorber
Our Advantages: 1. More than current 3000 moulds ,save your mold cost
2. ISO/TS 16949:2009 certificate
3.Competitive price
4.Strictly quality control capacity of APQP、FEMA、MSA、PPAP、SPC

Production Facilities

Bottom Valve Production FacilitiesBottom Valve Production FacilitiesBottom Valve Production Facilities

Examination Facilities


Bottom Valve Examination Facilities


Bottom Valve Examination Facilities

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