Cast Iron Gate Valve

Cast Iron Gate Valve Features

* Bolted Bonnet
* Replaceable O-ring
* Rubber encapsulated wedge, Brass Wedge Nut.
* Fusion bonded epoxy coated inside and outside ,blue RAL 5005, 250 Micron thick

* Working pressure from -1 to +16 Bar and working temperature from -10 to +80 ºC

Why choose cast iron gate valves？

1: What are the core advantages of cast iron gate valves?

The core advantage of cast iron gate valves stems from the dual support of material properties and structural design. Cast iron is known for its high strength and rigidity, making it capable of withstanding certain pressure impacts. It is suitable for low to medium-pressure working conditions, typically up to 1.6 MPa. Additionally, cast iron exhibits stable temperature resistance, allowing it to operate effectively within a temperature range of -10°C to 120°C. This makes it an ideal choice for various media, including water, steam, oil products, and neutral gases.

Moreover, cast iron is more cost-effective than materials like stainless steel. By meeting the essential requirements of industrial and civil applications, it can significantly lower the overall investment in pipeline systems. Furthermore, cast iron demonstrates excellent processing capabilities, enabling the creation of complex valve body structures through precision casting or forging processes. This ensures accurate sealing surface fits, thus enhancing the reliability of the valve.

2: How is the sealing performance of cast iron gate valves?

A: Most of them achieve sealing through the tight fit between the wedge-shaped gate and the valve seat. Some models are equipped with rubber or metal sealing surfaces, which can be selected according to the characteristics of the medium to ensure that the medium flow is effectively blocked in the closed state, with a low leakage rate.

3: Is the service life of cast iron gate valves guaranteed?

A: Under normal working conditions, the designed service life of cast iron gate valves can reach 10 to 20 years, and some high-quality products can even exceed 20 years. 

Material and process: The cast iron valve body treated with high-temperature annealing can reduce internal stress and lower the risk of cracking. The precisely machined sealing surface and valve stem help reduce wear and extend the lifespan of sealing performance.

Usage and Maintenance: Avoid operating the valve under excessive pressure or temperature. Regularly apply grease to the valve stem to prevent jamming and rust. For valves that have been closed for an extended period, it is advisable to open and close them 1 to 2 times each month to prevent the gate from sticking to the valve seat.

Medium Cleanliness: If the medium contains impurities such as sand and particles, it is essential to install a filter before the valve. This will prevent impurities from damaging the sealing surface or causing the gate plate to become stuck. Otherwise, it may lead to sealing failure or operational malfunction, shortening the service life.

4: Is installation and operation convenient?

A: Compact structure, moderate weight, and convenient for on-site installation; The handwheel or gear transmission design makes the opening and closing operation effortless, and the guiding structure between the valve stem and the gate plate can reduce jamming and improve the smoothness of operation.

5: In which industries and scenarios are cast iron gate valves specifically applicable?

A: Municipal engineering: Urban water supply distribution pipelines, inlet/outlet pipelines of sewage treatment plants, used to cut off or connect water flow, suitable for large-diameter pipeline requirements ranging from DN50 to DN1000.

Industrial systems: circulating water pipelines in power plants, low-pressure medium transportation pipelines in chemical plants, auxiliary water supply systems in the metallurgical industry.

Civil and commercial buildings: Heating pipelines in residential areas, air conditioning water circulation systems, fire protection pipelines, where manual or electric opening and closing control is required.

In the agricultural field, Main pipelines for farmland irrigation and water conveyance systems of pumping stations can withstand outdoor environments and intermittent usage requirements.