18-inch two-piece style Cast Steel Trunnion Ball Valve

Core product positioning

This product is a large-diameter high-pressure pipeline special ball valve. It adopts a two-piece split structure and an ear shaft fixed ball design. Combined with the ASTM A216 WCB cast steel valve body, it is specially designed for high-pressure and large-diameter working conditions such as oil, natural gas and water transmission pipelines to ensure long-term stable operation and reliable sealing in harsh environments.

Detailed technical specifications

Core design features

1. Two-piece valve body structure

Maintenance convenience: The middle part of the valve body is divided into two halves, which are connected by high-strength bolts, facilitating the inspection and replacement of internal components (balls, valve seats)

Structural stability: Compared with the three-piece structure, one set of sealing gaskets is reduced, enhancing the overall rigidity and sealing reliability of the valve body

Economy: While ensuring maintainability, the manufacturing cost is lower than that of the three-piece structure

2. Ear shaft fixing ball design

Low-torque operation: The ball is fixed through the upper and lower ear shafts, eliminating the direct thrust of the medium pressure on the ball. The operating torque is significantly reduced, being only 1/3 to 1/2 of that of a floating ball valve

High-pressure applicability: Particularly suitable for high-pressure working conditions of Class 600 and above, and the sealing performance is not affected by fluctuations in pipeline pressure

Double shut-off and relief function: When the valve is in the closed state, it can simultaneously isolate the upstream and downstream and safely release the pressure inside the valve cavity

3. Advantages of cast steel material

High strength: ASTM A216 WCB cast steel offers excellent mechanical properties and pressure-bearing capacity

Economical and durable: Suitable for non-corrosive media such as oil, natural gas, water, steam, etc., with outstanding cost-effectiveness

Welding flexibility: The valve body ports can be modified on-site by butt welding as required

Performance and Advantages

Typical application fields

Oil and gas: Long-distance pipeline shut-off valves, process valves for stations and yards

Urban gas: Main line control valves, key valves at gate stations

Water supply system: Control valves for large water transmission pipelines, inlet and outlet valves of pumping stations

Energy and power: Main control valve for power station cooling water system

Industrial pipelines: Control of various large-diameter process media

Installation and maintenance suggestions

Pre-installation inspection: Confirm that the valve specification matches the pipeline and remove any debris from the pipeline

Installation direction: Consider that the medium flow direction is consistent with the indicated direction of the valve

Operating space: Reserve sufficient space for actuators and maintenance

Regular maintenance

Monthly: Check for leaks and operational performance

Every year: Conduct sealing performance tests

It is recommended to carry out a comprehensive disassembly and maintenance every three years

Summary

The 18-inch two-piece cast steel ear shaft fixed ball valve is a high-performance industrial valve that integrates a large diameter, high-pressure capacity and convenient maintenance. Its ear shaft fixed design ensures low-torque operation and long sealing life under high-pressure conditions, while the two-piece structure guarantees the strength of the valve body while providing excellent maintainability. It is suitable for the control of large-diameter pipelines under various harsh working conditions and is an ideal choice for long-distance pipelines and large industrial systems.