Stainless Steel Threaded Check Valve

Product Description

The LIANHE Stainless Steel Threaded Check Valve is designed to prevent reverse flow and support the stable operation of compatible industrial piping systems. The valve opens automatically when the upstream pressure exceeds the downstream pressure and closes when the flow stops or reverses.

Manufactured with an investment-cast stainless steel body and precision CNC-machined connection surfaces, the valve provides dimensional accuracy, structural strength and reliable performance. Its compact threaded design simplifies installation in water, oil, gas and other compatible fluid systems.

Technical Specifications

LIANHE threaded check valves are available in multiple sizes, configurations and thread standards to meet different pipeline and project requirements. The full-bore design helps reduce unnecessary flow restriction and pressure loss.

• Size Range: 1/4"–4" (DN8–DN100)

• Bore: Full bore

• Valve Types: Vertical check valve, horizontal check valve and wafer check valve

• End Connection: Female threaded connection

• Thread Standards: BSPT, BSP, NPT, DIN 259/2999 and ISO 228

• Body Construction: Screwed-cap design, depending on the selected model

• Manufacturing Process: Investment-cast body with CNC machining

• Working Pressure: 200 PSI

• Operation: Automatic, pressure-activated operation

• Material Grades: CF8, CF8M, SS304 and SS316

• Design Features: Swing-type disc and integral seat, depending on the selected model

• Applicable Media: Water, oil, gas and other compatible fluids

• Brand: LIANHE

• Country of Origin: Wenzhou, China

The final valve type, material, thread standard, pressure rating and sealing components should be selected according to the operating medium, temperature, pressure, installation direction and piping-system requirements.

Product Advantages and Applications

Manufactured from CF8, CF8M, SS304 or SS316 stainless steel, the threaded check valve provides corrosion resistance and durability in many industrial and commercial fluid systems. The appropriate material should be selected according to the operating environment and the chemical compatibility of the conveyed medium.

The check-valve mechanism allows fluid to move in the intended direction while helping prevent reverse flow. Depending on the selected model, a swing-type disc or vertically operating closure element responds automatically to changes in system pressure.

The integral seating structure supports reliable shutoff and helps reduce the risk of backflow and media leakage. The compact threaded connection also enables straightforward installation and removal without requiring a flanged connection or permanent on-site welding.

The valve’s relatively simple construction can help reduce installation time and simplify routine inspection and maintenance. These characteristics make it suitable for new piping installations, system extensions, equipment connections and replacement projects.

Typical application areas include:

• Building-service piping

• Refrigeration systems

• Fuel-gas pipelines

• Medical facilities

• Food-processing facilities

• Environmental protection equipment

• Chemical-processing systems

• Water-treatment equipment

• General industrial pipelines

Compatibility must be confirmed before the valve is used with chemicals, fuel gas, food-contact media or other demanding fluids.

Quality Assurance and Certifications

LIANHE applies material, dimensional, thread, sealing and pressure inspections during production and before shipment. The inspection requirements may vary according to the valve model, production batch, applicable standard and customer order.

The company’s listed quality-management and product documents include:

• ISO 9001:2015

• GB/T 19001-2016

• CE

ISO 9001 and GB/T 19001 relate to the company’s quality-management system. The applicability of CE documentation should be confirmed according to the selected valve, pressure rating and destination market.

Factory Inspection Reports

Subject to the product model and confirmed order requirements, available inspection and quality documents may include:

• EN 10204 3.1 material test certificate

• Raw-material inspection certificate

• Radiographic test report

• Hydraulic sealing test report

• Thread inspection report

• Third-party inspection report

These inspections and documents can assist with material verification, dimensional confirmation and project-quality records. Please specify the required certificates and reports when requesting a quotation because some documents may require separate testing or third-party arrangements.

Packaging and Shipping

Standard Export Packaging

To protect the valves during storage and international transportation, LIANHE uses multi-layer export packaging.

Each valve is initially placed in a plastic bag to reduce exposure to moisture, dust and surface contamination. The packaged products are then arranged in protective cartons. Depending on the order quantity, valve size and shipping method, the cartons may be consolidated in wooden cases or secured on pallets.

Standard packaging includes:

• Plastic bags

• Protective cartons

• Wooden cases or pallets

Customized labels, cartons, markings and packing arrangements can be provided according to confirmed order requirements.

Payment Terms

The standard payment arrangement is:

• 30% T/T deposit

• 70% T/T balance before delivery

L/C at sight may also be accepted according to the order and agreed purchasing terms. Other payment methods, including Western Union and PayPal, can be discussed according to the order value and customer requirements.

Sample Policy

Free standard samples may be available for project evaluation, material verification and quality inspection.

The sample itself may be supplied free of charge, but international courier or express-delivery charges are not included and are normally paid by the recipient. Sample availability depends on the requested valve type, size, material, thread standard and current inventory.

For an accurate quotation or sample request, please provide the required size, valve type, stainless steel grade, thread standard, working pressure, operating medium, quantity and destination country.