5 min read
Butterfly Valves: Space and Cost Advantage on Large Diameters
On large-diameter lines, a butterfly valve instead of a gate valve usually saves space, weight and cost at once.
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Technical Articles
Engineering articles on industrial valve and expansion joint selection, applications, installation and maintenance.
Articles
6 min read
Pipe Expansion Joints: Expansion Accumulating in a High-Rise Riser
In a riser, expansion accumulates over the whole run rather than per floor. The first symptoms are banging inside the shaft and le...
6 min read
Drain Valves: Selecting for Lines That Carry Sediment
A drain valve carries the dirtiest fluid in the system, and that fluid erodes the seat. Closing geometry, position and freezing ri...
5 min read
Three-Way Ball Valves: In Diverting and Mixing Circuits
One body doing the work of two valves. But an L port and a T port are not the same thing, and confusing them leaves the circuit op...
5 min read
Sight Flow Indicators: They Measure Nothing, Yet Tell You Plenty
A sight flow indicator gives no flow rate; it is not an instrument. It is, however, the fastest way to confirm by eye that a pump...
5 min read
Check Valve Selection and Water Hammer
A check valve stops reverse flow; the real question is how quickly it stops it. A slow-closing check valve becomes the source of w...
6 min read
Reach Rods and Universal Joints: Turning a Valve You Cannot Reach
A valve at the bottom of a tank or down in the bilge can be turned from the deck. The difficulty is not turning it, but the backla...
6 min read
Bellows Squirm and Externally Pressurised Joints: Reversing the Pressure
A long, slender bellows pushed by internal pressure buckles sideways off its axis. The externally pressurised design removes that...
6 min read
Self-Closing Valves: Spring or Weight?
In a self-closing valve the closing force comes either from a spring or from a weight. The two differ in installation freedom and,...
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