Engineering Resources
Technical guides for valve selection, purchasing review, material decisions and project specification preparation.
Floating Ball Valve vs Trunnion Ball Valve
A floating ball is pushed toward the downstream seat by line pressure, while a trunnion-mounted ball is mechanically supported and transfers pressure load through the seat system. That difference changes torque, seat loading and the way larger or higher-pressure valves are selected.
Engineering GuideMetal Seated vs Soft Seated Ball Valve
Soft seats provide low-friction sealing when the selected polymer is compatible with the pressure, temperature and process fluid. Metal-to-metal seats are considered when heat, abrasion, erosion, solids or severe cycling move the service outside practical soft-seat limits.
Engineering GuideAPI 6D Ball Valve Guide
API 6D ball-valve inquiries normally define pipeline-service requirements around bore, body construction, pressure class, materials, seat arrangement, cavity-pressure behavior, testing and operator or actuator configuration.
Engineering GuideAPI 608 Ball Valve Guide
API 608 is commonly applied to metal ball valves used in industrial process service, including flanged and compact forged constructions. The standard is only one part of the purchasing definition.
Engineering GuideAPI 600 Gate Valve Guide
API 600 gate valves are selected around wedge construction, body and bonnet arrangement, pressure-boundary material, trim, stem, end connection and pressure class.
Engineering GuideAPI 602 Forged Valve Guide
API 602 compact forged gate, globe and check valves are frequently purchased in Class 800, 1500 and 2500 with socket-weld, threaded or butt-weld ends.
Engineering GuideAPI 594 Check Valve Guide
API 594 is used across several check-valve constructions, including dual-plate and other configurations where the closing element, body style and piping interface influence system behavior.
Engineering GuideAPI 609 Butterfly Valve Guide
API 609 butterfly valves can use concentric, double-offset, high-performance or triple-offset constructions depending on pressure, temperature, shutoff and service conditions.
Engineering GuideDBB vs DIB Ball Valve
DBB and DIB terminology describes isolation behavior, not simply the number of valve seats. The seat direction and pressure response need to be understood before the required arrangement is specified.
Engineering GuideSPE vs DPE Ball Valve Seats
A single-piston-effect seat can move to relieve excess body-cavity pressure when the pressure relationship across the seat reaches the design condition. A double-piston-effect seat can seal from either side across the seat.
Engineering GuidePTFE vs RPTFE Ball Valve Seats
Virgin PTFE offers low friction and broad chemical compatibility, while reinforced PTFE adds fillers that can improve mechanical strength, wear resistance and dimensional stability.
Engineering GuidePEEK Ball Valve Seat Guide
PEEK is used as a high-performance thermoplastic seat material where higher mechanical strength and temperature capability are required than common PTFE-based seats can provide.
Engineering GuideMetal Seated Ball Valve Coatings
Metal-seated ball valves often use hard coatings or hardfacing to improve wear, galling and erosion resistance on the ball and seat contact surfaces.
Engineering GuideWhat Does WCB Mean in Valves?
WCB refers to ASTM A216 Grade WCB, a cast carbon-steel material widely used for valve and fitting pressure boundaries in many industrial services.
Engineering GuideCF8 vs CF8M Valve Material
CF8 and CF8M are cast austenitic stainless-steel grades, with CF8M containing molybdenum and broadly corresponding to the chemistry associated with 316-type stainless steel.
Engineering GuideForged vs Cast Valve Body
Forged and cast valve bodies use different manufacturing routes that influence available geometry, section size, material product form and typical application ranges.
Engineering GuideDuplex vs Super Duplex Valves
Duplex and super-duplex stainless steels combine austenitic and ferritic microstructures, with super-duplex grades generally providing higher alloy content and stronger resistance to demanding chloride environments.
Engineering GuideHastelloy C276 Valves Guide
Hastelloy C276 is a nickel-chromium-molybdenum alloy selected for aggressive chemical and corrosion conditions where common stainless steels may not provide adequate resistance.
Engineering GuideMonel 400 Valves Guide
Monel 400 is a nickel-copper alloy used in selected marine and chemical services because of its corrosion behavior in specific environments.
Engineering GuideInconel 625 Valves Guide
Inconel 625 is a nickel-chromium-molybdenum-niobium alloy used where corrosion resistance and elevated-temperature capability are important design considerations.
Engineering GuideC95800 Nickel Aluminum Bronze Valves
C95800 nickel aluminum bronze is widely used in seawater and marine equipment because of its combination of mechanical properties and corrosion performance in appropriate conditions.
Engineering GuideTitanium Grade 2 Valves Guide
Titanium Grade 2 is commercially pure titanium used in selected chemical, seawater and desalination services where its corrosion behavior offers an advantage over common alloys.
Engineering GuideCryogenic Valve Selection Guide
Cryogenic valve selection is driven by minimum metal temperature, pressure, material toughness, stem sealing, bonnet extension, cavity-pressure behavior and leakage requirements.
Engineering GuideHydrogen Service Valve Selection
Hydrogen service requires review of leakage, material compatibility, pressure, temperature, cycling, valve cavity behavior and the sealing system rather than simply choosing a standard valve with a hydrogen label.
Engineering GuideNACE MR0175 Valves Guide
NACE MR0175 / ISO 15156 addresses materials for H2S-containing oil and gas production environments, but compliance depends on material condition, hardness and the specific environmental limits.
Engineering GuidePressure Seal Valve Guide
Pressure-seal bonnet construction uses internal pressure to increase sealing load at the bonnet joint, making it useful in high-pressure and high-temperature gate, globe and check valve service.
Engineering GuideDual Plate vs Swing Check Valve
Dual-plate check valves use spring-assisted plates with shorter travel, while swing check valves use a hinged disc that moves through a larger arc.
Engineering GuideAxial Flow Check Valve Guide
Axial-flow check valves guide the closure element along the pipe axis and are used where fast, controlled closing and low transient impact are important.
Engineering GuideTriple Offset Butterfly Valve Guide
Triple-offset butterfly valves use geometric offsets to reduce rubbing between the sealing surfaces during most of the disc travel and achieve metal-seated shutoff in demanding service.
Engineering GuideClass 150 vs 300 vs 600 Valves
ASME Class 150, 300 and 600 identify pressure classes, not fixed pressure values; allowable pressure depends on the valve material and design temperature.
Engineering GuideKnife Gate Valve vs Gate Valve
A knife gate valve is designed around a thin gate moving through slurry, fibers or solids-bearing media, while a conventional gate valve is normally selected for cleaner isola
Engineering GuideBidirectional vs Unidirectional Knife Gate Valve
Bidirectional knife gate valves are designed for shutoff with pressure approaching from either side, while unidirectional designs have a preferred pressure direction tied to t
Engineering GuideMetal Seat vs Resilient Seat Knife Gate Valve
Metal seats tolerate temperature, abrasion and solids differently from elastomer seats, while resilient seats can provide tighter soft-seat shutoff when the media and temperat
Engineering GuideKnife Gate Valve Actuator Selection
Knife gate actuator sizing is driven by gate area, maximum differential pressure, packing friction, seat friction, solids buildup and required margin rather than nominal valve
Engineering GuideSlurry Knife Gate Valve Selection Guide
Slurry service should be described by solids concentration, particle size and hardness, velocity, settling tendency, pressure differential and cycling because these factors co
Engineering GuideWastewater Knife Gate Valve Selection Guide
Wastewater knife gate valves may handle sludge, fibers, screenings and debris that can obstruct conventional valve cavities, making body geometry and gate wiping important sel