6 min read
Globe, Ball or Gate Valve: Which One Goes Where?
All three valve types shut off the line, but they do not do the same job. Throttling, tight shut-off or low pressure drop — that q...
Valve selection articles
Technical articles on Valve selection: valve and expansion joint selection, application and installation notes.
Articles
6 min read
Hygienic Butterfly Valves: Dead Volume in Food and Pharma Processes
On food and pharmaceutical lines, a valve’s most dangerous property is not leakage but a volume inside it that cannot be cleaned....
6 min read
Lug Type Butterfly Valves: Maintenance Without Draining One Side
A wafer valve is clamped between two flanges; remove one side and it has nothing left to hold it. A lug body bolts to each flange...
6 min read
Knife Gate Valves: Why an Ordinary Gate Valve Jams on Solids-Bearing Lines
On a line carrying solids, an ordinary gate valve failing to close is not a defect but a consequence of its construction. The knif...
6 min read
Class 150, 300, 600: Reading the Pressure-Temperature Table
A Class is not a pressure rating. The allowable pressure is read from the standard’s table together with body material and operati...
6 min read
Gate Valves with Position Indicators: Knowing a Valve Is Actually Shut
A gate valve does not tell you its position. A handwheel that will not turn is not proof of closure, and during commissioning or l...
5 min read
Pneumatic or Electric Actuator? Decision Criteria and Torque Margin
The first thing deciding actuator type is whether the plant has compressed air. Then come speed, fail position, environment and co...
6 min read
Needle Valves: Fine Control on Gauge, Transmitter and Sample Lines
A needle valve is not there to carry flow but to protect an instrument and isolate it. The tapered stem’s many turns make that pos...
6 min read
Gate Valves and DIN 3216, 3225, 3204: What the Number Actually Specifies
The DIN number on a gate valve is not a quality grade but a description of construction and face-to-face length. That is why a rep...
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