Butterfly Valves, Globe Valves, and Gate Valves: Practical Considerations for Use

Butterfly valveshttps://www.fluidovalve.com/butterfly-valve/ are super popular in medium and low-pressure big pipes. They have a simple build and open or close real quick. But, setting them up right and using them properly is key to make them work great.

Installation Considerations:

· Most butterfly valves handle flow both ways. But some eccentric ones need a specific flow direction.

· Make sure nothing blocks the valve disc’s spin, like pipe supports or nearby gear.

· For wafer-type butterfly valves, both flanges need to be lined up straight and match the valve’s length exactly.

· Tighten bolts evenly to avoid wonky stress.

· For flanged types, keep the sealing surface clean. Pick gaskets that fit the fluid—PTFE for corrosive stuff or metal gaskets for hot temps.

Operational Guidelines:

· Manual butterfly valves should be opened or closed slowly. Fast moves can cause water hammer from sudden flow changes.

· For electric or pneumatic ones, set open/close times to 5–30 seconds. Add buffering in control systems for smooth action.

· Don’t keep butterfly valves half-open (like 15°–75°) for long. It can wear out or shake the valve disc.

· In high-pressure setups, especially triple-eccentric metal seal types, check the disc seals tight before use. A manual pre-tighten might stop leaks.

Limitations:

· Butterfly valves aren’t great for super high-pressure (PN ≥ 4.0MPa) or super hot (≥400℃) fluids. They also struggle with thick or gritty fluids over long periods.

· For food or medical uses, go for sanitary-grade versions with stainless steel bodies and silicone seals.

Gate valves are best for full-open or full-close jobs, not for tweaking flow.

Installation Considerations:

· They handle flow both ways but need space planning. Rising-stem types need room above. Non-rising ones need clear open/closed tags on the body.

· Line up flanges straight during setup. Crooked alignment can twist valve bodies and mess up sealing.

· Pick flange gaskets based on the job—metal ring joints for steam or high-pressure, PTFE for corrosive fluids.

· Check after setup to make sure the gate moves smoothly without sticking.

Operational Guidelines:

· Never leave gate valves half-open. Partial openings let fast fluid jets wear out gate edges quick.

· When turning by hand, stop at full-open or full-close when resistance kicks in. Over-tightening can bend stems or break gates and seats.

Maintenance Requirements:

·Check gate-seat surfaces now and then. Minor wear can be ground out. Bad cases need new parts.

· Clean inside regularly if dealing with dirty fluids like rusty water.