Comprehensive Solution for Automotive Solenoid Valve Spring Design & Manufacturing

CATALOG's Industry Experience: Partnering with Leaders, Delivering Reliable Quality

Since 2016, CATALOG has been serving the automotive sector, which has become one of our three core business pillars. Our clients in this field include leading manufacturers of solenoid valves, boost valves, steering systems, and electronic throttle pedals. Today, approximately 90% of our customers are domestic and international OEMs, such as Geely, Volkswagen, Changan, Great Wall, General Motors, and BMW.

Our management and core technical team bring over ten years of spring industry experience from multinational companies, with deep expertise in project development and production management.

Meeting High?Demand Spring Specifications
Solenoid valve springs require exceptional precision, stability, minimal load decay, and high assembly yield. CATALOG engages from the early R&D phase, supporting customers with comprehensive requirements for dimensions, force values, fatigue life, and consistency. We collaborate across the entire process-from material selection, spring and process design, surface treatment, and presetting to gauging tooling and automated sorting-to ensure optimized development and manufacturing.

Evolving from Supplier to Development Partner
Through years of serving top automotive industry clients, CATALOG has evolved from delivering high?quality products to participating in synchronous development of core spring components. We have assisted customers in solving challenges related to tangled springs in sorting and assembly, co?developing automated spring sorting and pre?assembly equipment. This has not only significantly improved production efficiency, consistency, and yield, but also supported customers in overcoming bottlenecks in large?scale automated assembly-reducing costs and helping them capture greater market opportunities.

Case in Point: Solenoid Valve Springs
Below, we use solenoid valve springs (e.g., for carbon canister or fuel tank boost valves) as an example to illustrate how CATALOG has addressed customer pain points and delivered measurable improvements.

Customer Needs & Solutions (Combined)

Challenge	CATALOG's Response	Outcome
Inconsistent force values disrupt automated assembly, causing functional failures such as irregular fuel delivery, pressure fluctuation, and leakage.	• Implement high-precision automated coiling with in-line measurement and sorting. • Control force tolerance within ±5% for springs with stiffness ≤0.05 N/mm.	Stable, reliable spring performance that integrates seamlessly into automated production lines, eliminating functional defects.
Force decay and fatigue under continuous high-temperature operation (90-120°C), leading to shortened service life.	• Optimize stress-based design to prevent over-stress conditions. • Use high-grade, temperature-resistant materials. • Validate with 3-million-cycle fatigue testing (equivalent to 15-year/200,000-km vehicle life).	Springs maintain consistent force and exceed durability requirements, ensuring long-term performance in thermal environments.
Long development cycles and high prototyping costs due to unclear initial parameters and repeated design iterations.	• Deploy the "Huaxia Xing" intelligent design platform to rapidly simulate and compare multiple design options. • Achieve >99% correlation between predicted and actual force-life performance.	Development time and cost reduced significantly, accelerating customer time-to-market.
Spring tangling and deformation during packaging and transit, affecting both appearance and function.	• Introduce multi-level protective packaging: small bags inside larger bags, placed in partitioned boxes. • Offer custom packaging solutions such as single-cavity blister trays or continuous-feed reel packaging.	Zero tangling or deformation upon arrival; springs remain ready for immediate assembly.
Inefficient, high-cost manual/semi-automated assembly that cannot scale with production volume.	• Co-develop integrated automated systems for feeding, assembly, and 100% inspection. • Provide flexible equipment-service models (lease or purchase) including maintenance support.	Assembly efficiency and quality greatly improved, with overall production costs lowered for the customer.

CATALOG Spring Solutions

Precise and Stable Force Control

Equipped with high‑precision fully automatic spring coiling machines integrated with in‑line measuring and sorting systems, we maintain the force tolerance of springs with a stiffness (K‑value) of 0.05 N/mm within ±5% during high‑speed production, fully eliminating force instability.

Automated Assembly for Cost Efficiency

We partner with specialized automation equipment providers to deliver customized integrated systems for feeding, assembly, and 100% inspection (covering force, length, and other key indicators). Our “equipment development + operational maintenance” lease‑to‑own service model improves assembly efficiency and quality, achieving significant cost reduction and productivity gains.

Tangle‑Free Packaging Solutions

We adopt a graded packaging approach using bags‑within‑bags and boxes‑within‑boxes. For specialized projects, we provide single‑cavity blister trays, continuous‑feed reel packaging, or custom unitized packaging to completely prevent tangling and deformation during transit.

Fatigue Resistance & Load Retention

Through optimized spring design that avoids over‑stress risks and the use of certified brand‑grade materials, we ensure stable and consistent force performance throughout 3‑million‑cycle fatigue testing (equivalent to a 15‑year / 200,000‑km vehicle service life).

Shortened Development Cycles

Leveraging our in‑house “Huaxia Intelligent Manufacturing Design Platform,” we provide customers with multiple design proposals upfront, simulating force and lifecycle performance across different working strokes. With a >99% match between predicted and actual results, we help customers quickly finalize designs and proceed to prototyping, significantly reducing development time and cost.

CATALOG provides expert consulting services, technical insights, and professional solutions for various types of springs. Welcome to get in touch with us.

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