gate valves
11 in-depth engineering guides on gate valves — specification, selection, testing and procurement.
Everything on gate valves
Vajra's engineering team has published 11 technical guides covering gate valves for industrial valve selection, specification, testing and procurement. Browse the full set below.
Parallel Slide Gate Valves: Design, Thermal Advantages and Steam Applications
Parallel slide gate valves solve a problem that defeats wedge gate valves in high-temperature steam service: thermal binding. This guide explains their spring-loaded disc design and where they outperform wedge gates.
API 6D vs API 600 vs API 602 Gate Valve - Key Differences Explained
API 6D, API 600, and API 602 all cover steel gate valves but for very different applications - pipeline, process plant, and compact forged respectively. This guide explains which to specify.
Gate Valve Maintenance and Reconditioning - Field Repair vs Replacement
Gate valve maintenance choices - field repacking, seat lapping, Stellite overlay refacing, and pressure-seal ring replacement - can restore decades of additional service life when done correctly.
Valves for H₂S Sour Service - NACE MR0175/ISO 15156 Material Requirements
H₂S (hydrogen sulphide) is present in sour crude oil and natural gas streams, and at concentrations above the NACE sour threshold it causes rapid materials failures - sulfide stress cracking (SSC) and hydrogen-induced cracking (HIC). This guide explains NACE MR0175/ISO 15156 material requirements for valves in sour service.
Pressure Seal Bonnet Gate Valves: Class 900–2500 Selection Guide | API 600 | Vajra
Pressure seal bonnet gate valves use internal pressure to increase sealing force - making them the preferred design for Class 900–2500 high-pressure steam, feedwater, and hydrogen service where bolted bonnets become impractical.
Valve Selection Guide for Water Treatment and Desalination Plants
Water treatment and desalination plants present some of the most demanding valve selection challenges in process engineering - combining corrosive saline fluids, high-velocity flow, strict regulatory requirements for potable water compliance, and the need for ultra-low leakage in high-pressure reverse osmosis systems. This guide provides material selection, valve type recommendations, and pressure class guidance for every major service in a water treatment facility.
Valve Trim Selection: Soft Seat vs Metal Seat - A Technical Guide
Choosing between soft seat and metal seat trim is one of the most critical decisions in valve specification. Soft seats provide bubble-tight shut-off but are limited by temperature and abrasion; metal seats endure extreme temperatures and erosive service but require tighter machining tolerances. This guide breaks down the key differences.
Gate Valve Wedge Types: Solid, Flexible, Split, Parallel Slide - Selection Guide
The gate valve family encompasses several distinct wedge and disc designs - each optimised for specific operating conditions. Selecting the wrong wedge type leads to galling, thermal binding, difficulty operating, or poor sealing. This guide covers solid wedge, flexible wedge, split wedge, and parallel slide designs with selection criteria for each.
Globe Valve vs Gate Valve: Flow Control Versus Isolation Explained
Globe valves and gate valves are both multi-turn valves but serve fundamentally different functions. Gate valves are pure isolation devices; globe valves regulate flow. Choosing the wrong type leads to seat erosion, excessive pressure drop, or poor control. This guide explains when to use each.
Types of Industrial Valves: Complete Guide with Applications and Selection Criteria
Industrial valves are classified by their design and function into thirteen major types. This comprehensive guide covers every valve type used in oil & gas, power, chemical, water treatment, and pharmaceutical industries - with applications, standards, and selection criteria.
Ball Valve vs Gate Valve: Technical Comparison for Industrial Applications
Ball valves and gate valves are both used for on-off isolation, but they differ significantly in design, operating characteristics, seating performance, and maintenance requirements. This guide covers everything you need to know to make the right selection.
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