Cast/ductile iron concealed lever hard seal gate valves (DN40–DN2000), pressure rating: (PN6–PN25). All products are certified as pressure equipment in accordance with CE.

Size range: 1 1/2"–12" (DN40–DN300).

Operation mode: manual / gear operator / pneumatic / electric

Working pressure: PN16

Valve body material: cast iron / ductile iron

Valve disc material: cast iron / ductile iron

Valve seat material: brass / bronze / stainless steel

Valve stem material: stainless steel (SS)

Gland material: cast iron / ductile iron

Application: water, oil and gas

Shell test: 1.5 × (reference value)

Seat test: 1.1 × (reference value)

Payment method: T/T

Lead time: 5–30 days

1. Careful selection of materials in line with relevant standards, using high-quality components.
2. The valve fully meets the requirements of the relevant standard, with reliable sealing, excellent performance and an attractive appearance.
3. The sealing pair is advanced and well-designed. The sealing surfaces of the gate and valve seat are reliable, with high hardness, wear resistance and high-temperature resistance. Strong resistance to corrosion and scratching ensures a long service life.
4. After quenching and tempering, and surface nitriding treatment, the valve stem offers good corrosion resistance, scratch resistance and wear resistance.
5. It adopts a wedge-type elastic gate structure. For medium and large diameters, thrust bearings are provided to keep friction low, and it features impact-type manual operation for easy opening and closing.

1. Low fluid resistance: the sealing surface is less likely to be brushed and corroded by the medium.
2. Less operating force is required for opening and closing.
3. The flow direction of the medium is not restricted; it does not disturb the flow and does not reduce system pressure.
4. Simple design, short face-to-face length, good manufacturing performance and a broad range of applications.

Size range: DN40 to DN300
Temperature: -29 °C to 425 °C
Allowable operating pressure: PN16
Gate valves are widely used in petrochemical plants, metallurgical industries, water treatment facilities, thermal power plants and other oil and water steam pipelines for connecting or isolating the medium.

1. Handwheels, handles and transmission mechanisms must not be used for lifting. Collisions are strictly prohibited.
2. Double gate valves should be installed vertically (i.e., the valve stem in the vertical position, and the handwheel on top).
3. For gate valves with a bypass valve: open the bypass before opening the main valve (to balance the pressure difference between inlet and outlet and reduce the opening force).
4. Gate valves with an actuator/drive mechanism should be installed according to the product manual.
5. If the valve is operated frequently (open/close), lubricate at least once per month.

Advantages of Hard Seal Gate Valves

One prominent feature of hard seal gate valves is their superior sealing capability. These valves are designed with a robust sealing mechanism that minimizes leakage, effectively preventing any fluid or gas from passing through when the valve is in the closed position. This quality is particularly important in applications where contamination prevention and environmental protection are critical.

Another significant advantage of hard seal gate valves is their extended service life. Made from durable materials such as stainless steel or other hard alloys, these valves are engineered to withstand harsh operating conditions, including high pressure and extreme temperatures. This durability helps reduce maintenance costs and the frequency of replacements, making them a cost-effective solution for industrial use.

Additionally, hard seal gate valves provide excellent flow performance. Their design ensures minimal flow resistance, enabling smooth and efficient fluid transfer. This not only improves system performance but also helps reduce energy consumption, supporting modern sustainability goals across sectors such as water treatment, chemical processing and oil and gas.

Furthermore, the ease of operation of hard seal gate valves contributes to their popularity. They can be operated manually or automatically, providing installation flexibility. This adaptability allows systems to be tailored to specific operational needs without compromising efficiency or safety.

In conclusion, hard seal gate valves offer enhanced sealing performance, durability, excellent flow characteristics and ease of operation. These benefits make them an essential component in many industrial processes, ensuring reliability and operational efficiency. As industries continue to evolve, the role of hard seal gate valves is expected to grow further, solidifying their position in modern engineering solutions.

Hard Seal Gate Valves FAQs

What is a hard seal gate valve, and what are its primary applications?

A hard seal gate valve is designed to provide a tight seal with minimal leakage, making it suitable for applications that require unimpeded flow. They are commonly used in industries such as water supply, petroleum and chemical processing, where reliable isolation and control of fluid flow are essential. Their robust design helps handle fluid pressure and temperature extremes, making them suitable for both industrial and commercial installations.

What materials are used in the construction of hard seal gate valves?

Our hard seal gate valves are typically constructed using high-quality materials such as stainless steel, cast iron and carbon steel, selected for durability and long service life. The sealing surfaces are engineered for optimal performance, often using hard-facing materials to enhance wear and corrosion resistance. Depending on your specific requirements, we can supply valves suitable for different chemicals and fluids.

How do I determine the correct size of hard seal gate valve for my system?

Selecting the correct size for a hard seal gate valve is essential to ensure optimal performance. Consider the pipe diameter, the required flow rate and the system’s specific requirements, such as pressure and temperature ratings. If you are unsure, we recommend consulting a professional engineer or contacting our customer service team for assistance. We can provide guidance based on your system specifications to help you select the most suitable valve.

Are hard seal gate valves easy to install and maintain?

Yes. Hard seal gate valves are designed for straightforward installation and maintenance. They are provided with installation instructions and can be installed in various orientations. Maintenance requirements are typically minimal and often involve periodic inspections to ensure the seals remain effective. Our team is available to support you with maintenance recommendations to help extend the valve’s service life.

Do hard seal gate valves comply with industry standards?

Yes. Our hard seal gate valves are manufactured to meet or exceed applicable industry standards such as ANSI, API and ASME. Each valve is produced with rigorous testing to ensure quality and performance, so you can have confidence in its suitability for your applications. If you require specific certification or compliance documentation, please let us know and we will be pleased to assist.

Can hard seal gate valves be used in high-pressure applications?

Yes. Hard seal gate valves are well-suited for high-pressure applications. They feature robust construction and advanced sealing technologies engineered to withstand demanding conditions. When selecting a valve for high-pressure service, please confirm the pressure rating and consult our team if you have any questions. We can recommend the best options based on your specific requirements.