Yongda
Yongda
Explore our highly-durable brass controls, valves, and heating accessories designed for optimal system efficiency and zero leakage.
An Orifice Check Valve acts as a dual-function control mechanism essential in hydraulic and pneumatic circuits globally. It combines the directional safety of a check valve (preventing backflow) with the precise restriction of an orifice plate (regulating flow rate). In modern industrial, hydraulic, and HVAC installations, controlling fluid backpressure while metering the forward or reverse pilot flow is paramount. This whitepaper analyzes pricing configurations, ODM processes, manufacturing specifications, and macroeconomic variables driving the demand for these critical components.
By forcing media through a specified restriction in one direction while offering free-flow or absolute shut-off in the reverse, orifice check valves prevent sudden pressure spikes and component degradation in sensitive pipelines.
Reduces footprint and assembly cost. Instead of installing a separate needle valve or orifice fitting alongside a check valve, the integrated design mitigates potential leak points and streamlines fluid path architectures.
Different fluid viscosities, cracking pressures, and operating ambient conditions demand precision engineering. The diameter of the internal orifice must be calibrated based on precise engineering flow coefficients (Cv values).
Founded in 1996, Yuhuan Yongda Fluid Control Co., Ltd. (formerly Yuhuan Yongda Plumbing Co., Ltd.) is situated in the prestigious "China Valve Capital" – Yuhuan, Zhejiang. As an industry-leading plumbing and fluid control enterprise, our capabilities span across specialized product design, in-house R&D, advanced manufacturing, and global sales channels.
We partition our production into three key portfolios: brass valves, precision fittings, and commercial HVAC products. Our products target the mid-to-high-end global market. By utilizing lead-free brass formulations, eco-friendly surface treatments, and high-performance sealants, our solutions are highly favored by industrial integrators across North America and Europe.
Our newly established brand, Cokaren, represents our commitment to refined product finishes and superior structural integrity. Operating under the brand promise of "keep flowing, keep warming", Cokaren focuses on ensuring absolute stability, warmth, and reliable safety inside commercial structures and residential homes alike.
When engineering an custom check valve with an integrated flow orifice, the sizing coefficient ($C_v$) must be mathematically balanced with the valve’s spring cracking pressure. High cracking pressure ensures tight backflow sealing but demands higher system energy to initiate flow. Conversely, too small of an orifice diameter risks cavitational damage, fluid shear, and elevated thermal profiles in hydraulic systems.
| Engineering Parameters | Standard Brass Range | Specialized ODM Range |
|---|---|---|
| Available Sizes | G 1/2" to G 2" (DN15 - DN50) | 1/8" to 4" custom threads / flanged |
| Body Materials | HPb59-1, CW617N, Lead-Free DZR | Specialized Eco-Bronze, SS316L |
| Orifice Diameters | 1.0 mm to 5.0 mm | 0.2 mm to 12.0 mm laser-drilled |
| Cracking Pressure | 0.02 bar to 0.5 bar (Spring-loaded) | Up to 5.0 bar adjustable springs |
| Working Pressure | PN16 to PN25 (232 to 362 PSI) | PN40+ for heavy duty industrial systems |
| Sealing Gaskets | NBR, EPDM (Certified for water) | FKM (Viton), PTFE (Teflon) for chemistry |
Modern building infrastructure systems require complex balancing acts between heat generation, pressure release, and fluid allocation. In energy distribution systems (shown in our system architectures), check valves prevent the contamination of municipal cold lines from hot boiler loops. In hydronic underfloor heating loops, flow bypass elements and manual/automatic air vents work dynamically with valves to remove trapped gasses, avoiding localized cold spots.
As diagrammed in the energy distribution system, fluid control is divided into generation, distribution, and modulation zones:
By using Yuhuan Yongda’s integrated valves and manifolds, operators report up to 18% improvement in heat transfer rates due to reduced turbulence and microbubble formation.
The first line of defense in domestic water sanitation, can filter 98% of impurities in the pipeline.
Used to control the inflow and outflow of cold water and hot water in the boiler, with Spherical spool.
Used to discharge excess air in the air source water heater to ensure stable operation of the equipment.
Yongda maintains an unwavering commitment to quality: "Fine work, no leakage." To back this quality standard, our facilities implement rigorous quality checks, including 100% pneumatic sealing testing under pressurized water and spectroscopic material batch verification.
Our quality management operations conform strictly to international industrial metrics:
Whether you require lead-free brass compliance for European potability, or high-durability systems for North American HVAC applications, our certifications guarantee complete alignment with import regulations.
In B2B industrial procurement, pricing for Orifice Check Valves is dynamic, influenced by copper market fluctuations (LME index), custom tooling setup times, and the level of inspection requirements. Standard pricing estimates below are based on brass alloys HPb59-1 / CW617N with standard EPDM seals and minimum order quantities (MOQ) of 3,000 pieces per sizing configuration.
| Nominal Size | Thread Standard | FOB Ningbo/Shanghai Price Range (Est. USD) | Tooling Setup Fee (For Custom Orifices) | Sample Delivery Lead Time |
|---|---|---|---|---|
| DN15 (1/2") | ISO 228-1 / NPT | $1.85 - $2.40 | Free (Standard sizes) / $150 (Custom orifice) | 3 to 7 Days |
| DN20 (3/4") | ISO 228-1 / NPT | $2.60 - $3.25 | Free (Standard sizes) / $150 (Custom orifice) | 3 to 7 Days |
| DN25 (1") | ISO 228-1 / NPT | $3.90 - $4.80 | Free (Standard sizes) / $200 (Custom orifice) | 5 to 10 Days |
| DN32 (1-1/4") | ISO 228-1 / NPT | $5.50 - $7.10 | $100 (Standard sizes) / $250 (Custom orifice) | 7 to 12 Days |
| DN40 (1-1/2") | ISO 228-1 / NPT | $8.20 - $10.50 | Custom assessment required | 10 to 15 Days |
| DN50 (2") | ISO 228-1 / NPT | $12.50 - $16.00 | Custom assessment required | 10 to 15 Days |
Standard brass alloys are cost-effective but don't meet California's AB1953 lead-free drinking water laws. Opting for Eco-Brass or DZR (Dezincification Resistant) alloys adds approximately 15% to 25% raw material cost.
Standard drills allow a ±0.1mm tolerance. High-precision laser-drilling or CNC micro-machining with ±0.01mm tolerance requires continuous inspection and increases machining cycle times, slightly raising unit costs.
EPDM is standard for water (up to 120°C). If your application handles mineral oils, glycols, or higher temperatures (up to 200°C), Viton (FKM) or PTFE (Teflon) seals will be used, adjusting the final bill of materials cost.
As green energy standards tighten globally, fluid dynamic systems are being engineered for reduced pressure drops and higher thermodynamic efficiency. Yongda’s research division is actively developing next-generation orifice check valves to meet these needs:
Developing shape-memory alloy springs that dynamically adjust cracking pressure based on fluid temperature, optimizing flow during heating cycles.
Iterating internal contours using Finite Element Analysis (FEA) to reduce lime scale buildup around micro-orifices in hard water environments.
Continuously scaling CW724R and other silicon-containing lead-free brass formulations to exceed evolving global health standards.
Clear, direct answers from our Chief Engineering Office to address key technical and sourcing questions.
A1: Selecting the orifice diameter requires calculating your system’s minimum and maximum flow rate alongside allowable differential pressure ($\Delta P$). You must supply us with your media viscosity, operating temperature, target flow rate (L/min or GPM), and system working pressure. Our engineering team will calculate the Flow Coefficient ($C_v$) and specify the exact orifice dimension to prevent cavitation and ensure stable flow regulation.
A2: Yes. We offer a variety of brass alloys including standard HPb59-1, European standard CW617N, dezincification-resistant DZR brass, and lead-free configurations (such as C37700 or CW724R). For highly acidic or alkaline media, we can also supply 316L stainless steel bodies or custom inner trims using Viton seals.
A3: If standard housings are used and only the internal orifice insert needs modification, samples can be completed within 5-7 days. For fully custom body shapes requiring new forging tools and molds, mold development takes 20-25 days, followed by 10 days for sample validation. Standard mass production orders are typically fulfilled in 30-40 days depending on the volume.
A4: Our ISO9001:2015 quality protocol requires multi-stage testing. First, raw materials are checked via spectrometer. After machining, we perform 100% pneumatic testing under water at 1.5 times the maximum rated pressure to ensure there are no micro-porosities in the forged brass bodies. Finally, random hydraulic stress tests are conducted on each production batch prior to export packing.
A5: We typically operate on FOB Ningbo or Shanghai terms, but can arrange CIF or CFR delivery to your port of choice. For initial orders, our standard payment terms are a 30% T/T deposit to commence tooling and production, with the remaining 70% balance paid against the presentation of the Bill of Lading (B/L) copy. For long-term partners, we can discuss flexible L/C or open account credit lines.
Browse our complete catalog of industrial water controls, piping adapters, and venting components designed for long-term reliability.
