Cornerstone EE2/EE3/ST2/ST3 Trunnion Mounted Ball Valves
Cornerstone trunnion-mounted ball valves provide dependable isolation for demanding industrial applications. The EE2, EE3, ST2 and ST3 Series use an end-entry design with trunnion-supported ball construction.
The series supports both metal-seated and soft-seated configurations. Cornerstone also offers cryogenic, compact, two-piece and three-piece body options. This flexibility helps customers match the valve configuration to specific process conditions.
Pre-loaded, pressure-assisted seating provides bi-directional shut-off. The design prevents lateral ball movement along the flow bore. Pre-loading also supports uniform operating torque, while process pressure strengthens the seal.
Trunnion bearing supports maintain ball alignment and reduce ball and seat torque. Meanwhile, the rigid bolted body provides strength for severe-service applications.
The EE/ST Series covers an extensive operating range. ANSI sizes extend from 1 inch through 36 inches. API sizes range from 1-13/16 inches through 11 inches. Pressure ratings extend to ANSI/ASME Class 4500 and API 20000.
Temperature configurations range from -320°F through +1500°F. Therefore, customers can consider these valves for cryogenic, steam and other extreme-temperature applications.
Cornerstone includes double block and bleed as a standard feature. The company can also provide fugitive emissions packing and API 641 type-tested configurations upon request. In addition, designs may qualify to ISO 15848-1 requirements.
Westech Industrial can help review valve size, pressure class, temperature, materials, seating, leakage requirements and actuation. Our team can also support valve service and maintenance requirements throughout the equipment lifecycle.
For larger projects, Westech can integrate Cornerstone valves into custom-fabricated industrial systems. These projects can combine valves with piping, instrumentation, controls, skids, enclosures and other supporting equipment.
Quantity
PRODUCT FEATURES
REQUEST FOR INFORMATION
Description
Product Features
Trunnion-Mounted Design for Stable Ball Positioning
The EE/ST Series uses trunnion bearing supports to maintain ball alignment during valve operation.
The trunnion supports absorb mechanical loading rather than relying entirely on the seats. This arrangement also helps reduce ball and seat operating torque.
As a result, the design supports controlled operation across demanding pressure conditions.
Pre-Loaded, Pressure-Assisted Bi-Directional Seating
Cornerstone uses pre-loaded seating with pressure assistance for bi-directional isolation.
The design prevents lateral movement of the ball along the valve’s flow bore. Pre-loading also helps maintain consistent operating torque.
As process pressure increases, pressure assistance strengthens the seal. Therefore, the seating system combines stable operation with dependable shut-off performance.
Double Block and Bleed as Standard
Cornerstone includes double block and bleed capability as a standard feature of the EE/ST Series.
This arrangement provides additional process isolation where an application requires separation between upstream and downstream pressure.
Cornerstone also lists double isolation and bleed among the available configuration options.
Metal-to-Metal Body and Bonnet Seal
The EE/ST Series uses a metal-to-metal body and bonnet sealing arrangement.
Cornerstone designed this seal for reliable and fire-safe performance. This construction supports applications where severe operating conditions place greater demands on valve sealing.
Fire-safe configurations also appear among the available EE/ST options.
Rigid Bolted Body Construction
A rigid bolted body provides strength while maintaining configuration flexibility.
Cornerstone offers both two-piece and three-piece body options within the series. Therefore, customers can select a construction that suits their application and project requirements.
Compact configurations are also available when installation space requires a smaller valve arrangement.
Soft-Seated and Metal-Seated Options
Cornerstone offers both soft-seated and metal-seated configurations.
Soft-seated designs can provide API 598 bubble-tight shut-off. Metal-seated configurations support ANSI/FCI 70.2 Class V and Class VI leakage requirements.
This selection gives engineers more flexibility when considering temperature, process media and leakage requirements.
Cryogenic to High-Temperature Capability
The EE/ST Series covers temperatures from -320°F through +1500°F.
The lower end supports cryogenic applications. Meanwhile, the upper range allows configurations for demanding steam and high-temperature service.
Material, seat and seal selection should match the actual operating conditions.
Broad Pressure Range
Cornerstone offers the EE/ST Series across a wide range of pressure ratings.
ANSI/ASME pressure classes extend from 150 through 4500. API ratings range from 2000 through 20000.
This broad range makes the valve series suitable for many demanding process and energy applications.
Fugitive Emissions Options
Cornerstone can supply the valves with fugitive emissions packing.
API 641 type-tested configurations are available upon request. Cornerstone also states that all designs may qualify to ISO 15848-1 requirements.
API 622 also appears among the listed leakage and emissions requirements.
Multiple Stem Sealing Options
Secondary and tertiary stem seals are available for applications that require additional sealing protection.
These options allow customers to tailor stem sealing to specific process and environmental requirements.
Steam purge ports are also available for applications where process conditions require additional control around valve internals.
Multiple End Connections
Cornerstone offers several end connection styles.
Options include socket weld, butt weld, raised face, RTJ, hub ends and compact connections.
Applicable connection standards include ASME B16.11, ASME B16.5 and ASME B16.25.
Ball Coatings and CRA Overlays
Various ball coatings are available to address demanding process conditions.
Cornerstone also offers CRA overlays when an application requires additional corrosion resistance or specialized wetted surfaces.
These options provide greater flexibility for aggressive and challenging process media.
Broad Material Selection
Material options include carbon steel, stainless steel, duplex, chrome, molybdenum, nickel-based alloys and titanium-based alloys.
Cornerstone can also provide other exotic alloys upon request.
This selection helps customers match valve construction to pressure, temperature, corrosion and media requirements.
Flexible Actuation Options
The EE/ST Series supports manual, pneumatic, hydraulic and electric actuation.
Cornerstone also lists fully enclosed or magnetic operation and customer-specified configurations.
This flexibility allows the valves to work in manual systems or automated process applications.
Applications
Cornerstone EE/ST trunnion-mounted ball valves support demanding applications across several industrial sectors.
-
- Oil and gas production
- Natural gas
- Crude oil
- Ore slurries
- Steam
- Condensate
- Ammonia
- Fertilizer processing
- Cryogenic applications
- High-temperature applications
- High-pressure process isolation
- Double block and bleed applications
Cornerstone specifically identifies oil and gas, natural gas, crude oil, ore slurry, steam, condensate, ammonia and fertilizer applications for this series.
Manufacturer info
Cornerstone Valve designs and manufactures specialty ball valves for severe-service industrial applications. Its focus on custom-engineered, fit-for-purpose solutions helps address demanding pressure, temperature and process conditions.
