valve selection
16 in-depth engineering guides on valve selection — specification, selection, testing and procurement.
Everything on valve selection
Vajra's engineering team has published 16 technical guides covering valve selection for industrial valve selection, specification, testing and procurement. Browse the full set below.
Boiler Blowdown Valves: Continuous and Intermittent Blowdown Selection
Boiler blowdown removes accumulated dissolved solids and sludge to keep steam quality high and prevent scale and carryover. The valves that do it face flashing, high pressure, and abrasive service. This guide covers continuous and intermittent blowdown valves, tandem arrangements, and IBR requirements.
Amine Gas Treating Valves: Selection for Sweetening and Acid-Gas Removal
Amine gas-treating units remove hydrogen sulphide and carbon dioxide from natural gas and refinery streams. The circulating amine, the acid gas, and the regenerator conditions create a demanding mix of corrosion and erosion. This guide covers valve selection across the amine loop, materials, and specification.
Gate Valve vs Ball Valve - How to Choose the Right Isolation Valve
Gate valves and ball valves both provide on/off isolation, but each excels in specific size ranges, pressure classes, and service conditions. Here's a definitive selection guide.
Valve Selection for LPG Service: Propane, Butane & NGL Handling
LPG service requires fire-safe, ASME B16.34-rated valves with appropriate pressure ratings and material selection - propane at –42°C boiling point and butane's flash point characteristics create specific valve specification requirements.
Valve Selection Checklist: 10 Parameters Procurement Engineers Must Specify
Incomplete valve specifications are the single biggest cause of delivery delays and wrong-material supplies. This checklist covers 10 parameters every valve RFQ must define - from line class to fire-test certification.
Butterfly Valve Types: Concentric vs Double-Offset vs Triple-Offset - Complete Comparison
Butterfly valves come in three geometrically distinct designs - concentric, double-offset, and triple-offset - each offering different seat types, shutoff class, and temperature limits. Choosing the wrong type for the service can result in seat leakage, premature wear, or fire-safety non-compliance.
Plug Valve Types - Lubricated vs Non-Lubricated vs Eccentric: Complete Guide
Plug valves are one of the oldest valve designs - a tapered or cylindrical plug with a through-port that rotates to open or close flow. In modern plants they occupy a specific niche alongside ball valves: lubricated plug valves for crude oil and heavy product pipelines, non-lubricated PTFE-sleeved designs for chemical service, and eccentric plug valves for slurry and abrasive service. This guide explains the three main types.
Ball Valve vs Butterfly Valve: Which Should You Choose?
Ball valves and butterfly valves are both quarter-turn designs, but they serve very different applications. This guide compares them on shutoff class, pressure rating, temperature range, size, cost, and suitability for specific services.
Gate Valve vs Globe Valve - Which to Use for Isolation and Which for Control?
Gate valves and globe valves are both multi-turn valves and are often confused - but they serve fundamentally different purposes in a piping system. Gate valves are designed for full-open or full-closed isolation with minimum pressure drop. Globe valves are designed for throttling and flow regulation, accepting higher pressure drop in return for controllable flow. This guide explains when to use each.
Trunnion Mounted vs Floating Ball Valves: Complete Selection Guide
Trunnion mounted and floating ball valves share the same quarter-turn mechanism but differ fundamentally in how the ball is supported and how sealing is achieved. Selecting the wrong type for your operating pressure can result in seat leakage, excessive torque, or premature wear. This guide covers design principles, pressure limits, torque requirements, and industry-specific selection criteria.
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.
Needle Valve Applications and Selection Guide
Needle valves provide precise flow throttling and positive shut-off in instrument, sampling and hydraulic service. This guide covers construction types, pressure-temperature ratings, materials and selection criteria for demanding applications.
Plug Valve Types and Selection Guide: Lubricated, Eccentric and Lined
Plug valves use a tapered or cylindrical plug to provide quarter-turn on/off isolation. This guide compares lubricated, non-lubricated, eccentric and lined designs, covering construction, pressure ratings, standards and industry applications.
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.
Butterfly Valve Types: Concentric, High-Performance and Triple-Offset - Complete Selection Guide
Butterfly valves come in three main designs - concentric (resilient-seated), double-eccentric (high-performance), and triple-offset (metal-seated). Understanding the differences is essential for selecting the right butterfly valve for water, HVAC, oil and gas, power, or chemical service.
How to Select the Right Industrial Valve: A Step-by-Step Engineering Guide
Selecting the wrong valve for a process application leads to leakage, premature failure, safety incidents, and costly downtime. This engineering guide walks through every factor to consider - from process conditions and materials to standards and actuation - to ensure the right valve is specified every time.
Related topics
Need valves engineered for valve selection?
Our engineering team writes these guides and supplies the valves. Send your requirement for a specification review and a 24-hour quote.