Zhongguan Valve's 304 or 316 Grade Stainless Steel Butterfly Valve employs an advanced sealing structure. Addressing the limitations of ordinary butterfly valves in withstanding high temperatures and pressures, we have introduced a triple-eccentric metal hard seal structure. Through the precise fit between the valve seat and the sealing surface, this effectively improves the valve's sealing stability under high-pressure conditions.

(Item)	(Specifications)
Material Grade	ASTM A351 CF8 (304), CF8M (316), CF3M (316L)
Nominal Diameter	DN40 - DN1600 (Support customization for larger sizes)
Pressure Rating	PN10, PN16, PN25, Class 150, Class 300
Sealing Type	Soft Seal (EPDM, PTFE) / Metal Hard Seal (Triple Eccentric)
Connection Method	Wafer, Lug, Flanged, U-Section
Standard Compliance	API 609, ASME B16.34, GB/T 12238, ISO 5211
Operating Temp	-29°C to 425°C (Depending on seal material)

Technical Advantages and Structural Characteristics

Zhongguan Valve's 304 or 316 Grade Stainless Steel Butterfly Valve is designed with the diversity of media in mind from the initial stages:

Material Stability: The valve body is made of 304 or 316 grade stainless steel, possessing strong resistance to oxidation and acid/alkali corrosion.

Triple Eccentric Design: Utilizing a triple eccentric metal hard seal structure, the sealing surface immediately disengages upon opening, reducing friction; upon closing, it achieves a compensating effect of increasing tightness as torque increases.

Multi-Layer Sealing Technology: The stainless steel butterfly plate edge employs multi-layered soft and hard stacked sealing rings, balancing the rigidity of metal with the tightness of an elastic seal.

Diverse Drive Methods: Manual handle, worm gear drive, pneumatic, electric, or hydraulic actuators can be selected according to site conditions.

Industry Applications

Due to the excellent material properties of 304 or 316 grade stainless steel butterfly valves, their applications cover a wide range of fields, from basic water supply and drainage to complex processes:

Water Treatment Engineering: Municipal water supply, seawater desalination, and industrial wastewater treatment.

Chemical and Pharmaceutical: Transportation of corrosive media (316L grade is recommended for strong corrosion resistance).

Food and Beverage: Precision-polished sanitary butterfly valves that meet relevant hygiene and safety requirements.

HVAC: Hot and cold water circulation systems, ensuring long-term leak-free operation.

Energy and Marine: Seawater cooling systems and boiler feedwater piping.

Why Choose Zhongguan Valve?

As a China Valve Supplier with many years of experience in the industry, Zhongguan Valve has developed unique production and service advantages:

1. 19 Years of Professional Manufacturing Experience

We have focused on valve manufacturing since 2005. Leveraging our two major production bases in Tianjin (focusing on cast iron hydraulic valves in northern China) and Wenzhou (focusing on industrial stainless steel valves in southern China), we have achieved integrated supply across all materials and the entire industry chain.

2. Complete Production Equipment Our factory is equipped with a complete production line, including pressure testing machines, valve seat precision installation equipment, bushing installation machines, and automated marking machines. Every 304 or 316 Grade Stainless Steel Butterfly Valve undergoes rigorous pressure testing and torque calibration before leaving the factory.

3. Global Supply Capability Our stainless steel butterfly valve series are best-selling export products, long-term suppliers to Southeast Asia and the five Central Asian countries. With stable quality and high cost-effectiveness, we have accumulated a good reputation in overseas distribution channels.

Frequently Asked Questions (FAQ)

Q: What is the difference between 304 and 316 stainless steel in butterfly valve applications?

A: 304 stainless steel is suitable for general freshwater and neutral corrosive environments; 316 stainless steel, due to the addition of molybdenum, has better pitting corrosion resistance in environments containing chloride ions (such as seawater) or strong acid and alkali environments. Q: How to choose the appropriate sealing material?

A: If the medium temperature is below 120°C and there is no strong corrosion, EPDM soft seals can be selected; for high-temperature, high-pressure, or abrasive conditions, it is recommended to choose a 304 or 316 grade stainless steel butterfly valve metal hard seal.

Q: Do you support non-standard customization?

A: Yes. Zhongguan Valve can be customized according to your pipeline pressure (PN/Class) and connection method (flange/wafer/lug).