Question 1

What are the main types of industrial valves?

Accepted Answer

Industrial valves are classified into four main groups: (1) Isolating/block valves - gate, ball, butterfly, plug, and diaphragm valves used to start or stop flow completely; (2) Regulating/control valves - globe valves and control valves used to vary flow rate; (3) Non-return/check valves - swing, tilting disc, dual plate, and wafer check valves that prevent backflow; (4) Safety valves - safety relief valves, pressure safety valves, and rupture discs that protect equipment from overpressure.

Question 2

Which valve type is best for on/off isolation?

Accepted Answer

Ball valves are the best general-purpose on/off isolation valve for sizes up to 6 inch due to their quarter-turn operation, bubble-tight shutoff, and compact face-to-face length. Gate valves are preferred for larger sizes (8 inch and above) where cost and full-bore flow are priorities and operation is infrequent. Butterfly valves are economical for large-bore low-pressure applications such as water utilities, HVAC, and fire protection in sizes DN80 to DN1200.

Question 3

Which valve is best for throttling and flow control?

Accepted Answer

Globe valves are the standard throttling valve for manual or actuated flow control in process piping. For automated modulating control in process loops, cage-guided globe control valves (with pneumatic diaphragm actuators) provide the best combination of Cv rangeability (50:1 to 100:1), control accuracy, and low noise. V-port ball valves are a good throttling alternative for fibrous or viscous fluids where globe control valves would plug or wear rapidly. Butterfly valves can throttle at 20-70% open for low-precision flow control in large-bore lines.

Question 4

What is the difference between a gate valve and a globe valve?

Accepted Answer

Gate valves and globe valves are both rising-stem, multi-turn valves but serve different purposes. Gate valves use a wedge or parallel gate sliding perpendicular to flow - they create minimal pressure drop when fully open (zero obstruction) and are designed for on/off use only, not throttling. Globe valves use a disc moving axially into a circular seat ring - they always create some pressure drop even when fully open but provide excellent flow regulation and throttling capability. Gate valves are chosen for isolation; globe valves for flow control and regulation.

Question 5

How do I select the right valve for slurry service?

Accepted Answer

Slurry service requires valves with full-bore, obstruction-free flow paths and abrasion-resistant materials. Knife gate valves are the primary choice for slurries above 5% solids content - the gate shears through the slurry as it closes. Pinch valves (rubber sleeve valves) are ideal for abrasive slurries as the only wetted part is the replaceable rubber sleeve. Diaphragm valves work for low-pressure corrosive slurries in chemical and pharmaceutical plants. Standard ball, gate, and butterfly valves wear rapidly in abrasive slurry service and are generally not recommended.

Valve Type	Liquid	Gas	Steam	Slurry	Cryogenic	Throttle
Ball Valve
Gate Valve
Globe Valve
Butterfly Valve
Check Valve						-
Plug Valve
Needle Valve
Safety/Relief						-
Diaphragm Valve
Pinch Valve
Control Valve

Industrial Valve Types - Complete Engineering Guide

Valve Classification Overview

All 14 Valve Types - Reference Cards

Ball Valves

Gate Valves

Globe Valves

Butterfly Valves

Check Valves

Plug Valves

Needle Valves

Safety & Relief Valves

Strainers

Diaphragm Valves

Pinch Valves

Actuators

Accessories

Control Valves

Valve Type Selection Matrix

Valve Type Selection - FAQ