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Yancheng Longwan Machinery Co., Ltd. HOME / PRODUCTS & APPLICATION / Grey Cast Iron / Grey Cast Iron Valve Accessories

Grey Cast Iron Valve Accessories Foundry

Grey Cast Iron Valve Accessories offers a range of valve accessories made of high-quality grey cast iron. These accessories play a vital role in valve systems with their good durability, stability and economy. Grey cast iron, with its good castability and wear resistance, is one of the ideal materials for manufacturing valve accessories. In this category, you will find key components designed specifically for valves, such as the box cover - as a key closing part of the valve box, it not only protects the internal mechanism of the valve from the influence of the external environment, but also ensures the sealing performance of the valve in the closed state. The design of the box cover fully considers the sealing, strength and easy maintenance, ensuring that the valve can maintain stable performance during long-term use.

Grey Cast Iron Valve Accessories OEM/ODM
ABOUT US
Yancheng Longwan Machinery Co., Ltd.
Yancheng Longwan Machinery Co., Ltd.
Founded in 2006, which located next to National Highway 204 in Yancheng City, Jiangsu Province, 40km from the center of Yancheng City, 5km from the center of Dongtai City, 30km from Dafeng District, and 10km from the exit of Baiju Expressway, with convenient transportation. We mainly produce various types of fire-fighting pipe fittings, reducer parts, auto parts, agricultural machinery, and industrial robot parts. Its main customers include SAIC Group, Deere, Bonfiglioli (China), Shanghai Beixu, Yaskawa Electric, etc. As a famous China Grey Cast Iron Valve Accessories Foundry and Grey Cast Iron Valve Accessories Suppliers, our company has a variety of molding equipment, including one vertical sand-shot horizontal parting boxless shot-press molding line with specifications of 610*510*240, 120 boxes/hour, suitable for mass production of small parts; one upper and lower sand-shot horizontal parting boxless shot-press molding line with specifications of 750*650*250, 100 boxes/hour, suitable for mass production of small and medium-sized parts; 3 sets of 1.25T medium-frequency electric furnaces; 3 cleaning shot blasting machines, and now planning a lost foam production line, suitable for 100Kg~1000Kg casting production, and planning an automatic spray painting line and an electrophoretic coating line at the same time, 3 CNC lathes and 3 lathes.
Yancheng Longwan Machinery Co., Ltd.

ODM Customization Expert

Advanced Production & Processing Equipment

Longwan Machinery has a variety of advanced domestic and foreign molding equipment, including 2 fully automatic production lines for clay sand, 1 semi-automatic production line for clay sand, and 1 coated sand production line, with an annual production capacity of 15,000 tons.

Yancheng Longwan Machinery Co., Ltd.

Complete Inspection Flow

Strict Quality Inspection

We have full-process testing equipment: spectrum analyzer, metallographic microscope, universal tensile testing machine, magnetic particle flaw detector, ultrasonic flaw detector, etc.
The above equipment can fully ensure that we can provide customers with high-precision final castings, and at the same time ensure that we meet customers' comprehensive testing requirements for physical and chemical properties of materials, non-destructive testing, high-precision geometric dimension testing, etc.

Professional Casting Expert

Comprehensive Casting Manufacturer

FAQ
  • Q
    Where are your products mainly exported to?
    A

    Our products are mainly exported to multiple countries such as Germany, Japan, Italy, South Korea, and Australia.
  • Q
    How to deliver the goods to us?
    A

    Usually, we ship by sea, which is very convenient for export.

    Of course, if the customer's goods are urgent, we can also air freight them. Ningbo Airport and Shanghai International Airport are both very close to us.
  • Q
    What's the payment term?
    A

    When quoting, we will confirm the transaction method with you.

    For mass production, we usually make a 50% advance payment in advance and then inspect and confirm the shipment before paying the remaining balance.
  • Q
    How to guarantee the quality of your goods?
    A

    Firstly, there will be corresponding inspections after each process, and for the final completed product, we will conduct a full inspection according to customer requirements and international standards;

    Then, we have advanced and complete top testing equipment in the industry: spectral analyzers, metallographic microscopes, universal tensile testing machines, magnetic particle testing machines, ultrasonic testing machines, etc.

    The above equipment can fully ensure the provision of high-precision final castings to customers, while also meeting the comprehensive testing requirements of customers for material physical and chemical properties, non-destructive testing, high-precision geometric dimension testing, and so on.
  • Q
    How many employees of your company? what about the technicists?
    A

    Our company has more than 120 employees, including 10 professional technicians and 5 engineers.
  • Q
    How about the capacity of your company?
    A

    We have 2 fully automatic clay sand production lines, 1 semi-automatic clay sand production line, and 1 coated sand production line, with an annual production capacity of 15000 tons.
  • Q
    Do you have some standard parts?
    A

    No, currently we produce and customize according to the requirements based on the drawings provided by the customer.
  • Q
    Can you do customized products?
    A

    Yes, we are mainly doing customized products according to the customers’ drawings or samples.
  • Q
    What applications do your products relate to?
    A

    Our products cover almost all the applicable equipment manufacturing and machinery manufacturing and processing fields, mainly including automotive trucks, engineering machinery, agricultural machinery, reducers, water pumps, water treatment systems, and other fields.
  • Q
    what products can you offer?
    A

    We mainly produce cast iron parts made of gray cast iron and ductile iron materials.
  • Q
    Are you a direct manufacturer or trading company?
    A

    We are a foundry and a manufacturer of cast iron parts.
  • Q
    How long can I get the feedbacks after we sent the inquiry?
    A

    We will reply to you within 24 hours of the working day.
NEWS
Grey Cast Iron Valve Accessories Industry knowledge

Yancheng Longwan Machinery Co., Ltd. is a foundry producing Grey Cast Iron Valve Accessories manufacturer parts for valve builders, fire-protection contractors and OEM equipment programmes. We have poured castings at our Yancheng City site in Jiangsu Province since 2006, working from customer drawings or physical samples and delivering cleaned, machined and documented components ready for assembly.

Valve accessories sit between the pressure-containing body and the operating mechanism. Flake graphite grey iron gives these parts the vibration damping, thermal stability and wear behaviour the application needs, with a cost structure that suits series production. Our range covers closure and housing components such as the box cover — the closing part that shields the internal mechanism and preserves sealing performance in the closed position — together with the brackets, glands, yokes and connection pieces that complete a valve assembly.

Valve Accessory Part Families We Cast

Every valve accessory we supply is quoted against the customer's drawing, so geometry, wall section and machining allowance are set by the part itself rather than by a standard catalogue. The table below shows the component families we run most often and the casting characteristics that decide how each one is tooled.

Component family Function in the valve Casting characteristics we control Typical service
Box cover / bonnet Closes the valve cavity and protects the internal mechanism from the external environment Wall section uniformity, flange flatness, sealing face machining allowance, pattern draft for easy maintenance access Fire-protection mains, water distribution
Body and end-connection housings Contains the flow path and joins to pipework Core integrity, bore concentricity, bolt-circle position, flange thickness Water treatment, HVAC, industrial pipework
Gland, cover plate and packing retainers Compress and locate the stem seal Face flatness, bore clearance, hole and thread layout after machining Gate and globe valve assemblies
Yokes, brackets and mounting feet Carry actuator or handwheel load into the body Rib placement, mounting face flatness, position of tapped holes Actuated valves, remote-operated stations
Stem nuts, hubs and small hardware Transmit operator or actuator torque As-cast soundness, thread quality, hub bore and keyway handed over from turning Manual and geared valve operators

Material and Specification Variables

We pour to the grade written on the drawing, and the melting and sand practice follow the section thickness of the accessory. The variables that most often change a valve accessory configuration are:

  • Grey iron grade and microstructure — flake graphite grades in the HT200–HT250 / GJL-200–GJL-250 band are routine, with pearlite content and hardness confirmed on the sample.
  • Casting mass and wall section — thin-wall covers and small hubs run on the automatic lines; heavier bodies are scheduled according to pattern plate size.
  • Machining allowance and datum strategy — sealing faces, bores and mounting faces are agreed so that NC fixtures locate on the same datums used at inspection.
  • Surface treatment — shot-blasted finish as standard; primer or colour coating and electrophoretic coating capability is being added to the finishing route.
  • Pressure and media conditions — steam, water, chemical dosing and oil-and-gas service all change the corrosion allowance and section requirements we confirm with the drawing owner.

Molding Capacity and Size Fit

Our foundry runs two fully automatic clay sand lines, one semi-automatic clay sand line and one coated sand line, with an annual casting capacity of 15,000 tonnes. Melting is handled by three 1.25 tonne medium-frequency electric furnaces, and three shot-blasting machines clean the output.

Production unit Plate / mould size Rate Best fit
Vertical sand-shot, horizontal parting, boxless shot-press line 610 × 510 × 240 mm 120 boxes/hour Volume production of small valve accessories
Upper/lower sand-shot, horizontal parting, boxless shot-press line 750 × 650 × 250 mm 100 boxes/hour Small and medium accessories, cored bodies
Lost foam line (in planning) 100 kg – 1000 kg casting range Project dependent Large single-piece housings

Machining, Cleaning and Finishing

Three CNC lathes and three lathes handle turned features — sealing face preparation, bores, stem threads and hub fits — so a valve accessory can leave us as a finished machined part rather than an as-cast blank. Shot blasting removes sand and scale before inspection.

An automatic spray painting line and an electrophoretic coating line are being planned alongside the casting expansion, extending the finishing scope for valve accessories that need corrosion protection and a consistent colour finish.

Quality Control and Acceptance Testing

Our works operate to the IATF 16949:2016 system standard, with inspection scheduled at each process step and a full inspection of finished parts against customer requirements before shipment. Material performance testing covers a German SPECTRO direct-reading spectrometer, tensile testing machine, 3 t Brinell hardness tester, sonic velocity meter and metallographic microscope; non-destructive checks use magnetic particle and ultrasonic flaw detection.

Sand control runs on dedicated equipment — SAC hammer-type sample maker, SWY hydraulic strength tester, SSZ vibration sand screener and SGS double-disc infrared dryer — which keeps mould strength and moisture stable across a production run. Acceptance for valve accessories is normally agreed as a combination of grade certificate, hardness, dimensional report on the datums, and a visual or NDT check on sealing and mounting faces.

ODM/OEM Project Flow

  1. Drawing or sample review, with a quotation issued after the customer confirms the interpretation.
  2. Pattern and mould manufacture, including process simulation by our R&D engineers to shorten the development cycle and reduce scrap.
  3. Sample castings produced from the tooling and submitted for dimensional and material approval.
  4. Series production on the moulding lines, with in-process inspection and final inspection before release.
  5. Inspection results shared, shipment confirmed, and delivery by sea or air as the schedule requires.

Information We Use to Configure Your Solution

We build a valve accessory quotation from the working point and the drawing, not from a generic price list. The inputs that determine tooling, process route and unit cost are:

  • 2D drawing or 3D model, with the current revision and the datums used for machining and inspection.
  • Grey iron grade, hardness range and any microstructure requirement.
  • Finished mass, maximum wall section and overall envelope, so the part can be matched to a moulding line.
  • Machined features required, coating or painting specification, and any marking or traceability demand.
  • Annual volume, call-off pattern and packaging type, including pallet or returnable-bin requirements.
  • Media, temperature and pressure conditions, which set the section and corrosion allowance for the application.

Related Cast Iron Ranges

Grey Cast Iron

The parent flake graphite range: automotive, agricultural, reducer, water pump, semiconductor and robot accessories poured on the same lines.

Ductile Cast Iron Valve Accessories

Nodular iron equivalents for valve accessories that must absorb impact or pressure surge rather than rely on damping alone.

Ductile iron Pipe Fittings

Fittings and fire-protection pipe components that pair with valve accessories in water mains and riser assemblies.

Frequently Asked Questions

Which valve accessory parts do you cast in grey iron?

We produce valve accessories to customer drawings, including box covers and bonnets, body and end-connection housings, glands and cover plates, yokes and mounting brackets, and small turned hardware such as stem nuts and hubs. There is no fixed standard catalogue — each part is tooled from the drawing or sample supplied.

How is material quality documented for a valve accessory order?

Chemistry is checked on the German SPECTRO direct-reading spectrometer, and mechanical results come from the tensile testing machine, 3 t Brinell hardness tester and sonic velocity meter, with metallographic examination where the drawing calls for a microstructure requirement. Our works run to the IATF 16949:2016 system standard, and inspection records are issued with the shipment.

What casting size range suits your moulding lines?

The 610 × 510 × 240 mm vertical shot-press line runs small valve accessories at 120 boxes per hour, and the 750 × 650 × 250 mm line handles small and medium parts at 100 boxes per hour. A lost foam line for 100 kg to 1000 kg castings is in planning for larger housings.

Can you take a valve accessory from drawing to series supply?

Yes. The ODM/OEM route runs through drawing confirmation and quotation, pattern manufacture, sample castings for approval, then series production with in-process and final inspection before shipment. Our R&D engineers run process simulation before tooling is cut, which shortens development time and lowers the scrap rate on new parts.

Do you machine and finish the castings before delivery?

Three CNC lathes and three lathes are available for turned features such as sealing faces, bores and threads, and three shot-blasting machines clean the castings after fettling. An automatic spray painting line and an electrophoretic coating line are being added to extend corrosion protection and colour finishing.

How are valve accessories packed and shipped?

Packaging is agreed per order, including palletised or binned arrangements for machined parts, and custom packaging design can be provided. Shipments normally move by sea, with air freight available for urgent quantities through Ningbo Airport and Shanghai International Airport, both close to our plant.