globe valve vs ball valve
Production-stage selection for globe valve vs ball valve starts with the intended function: isolation or characterized throttling. A quarter-turn ball can isolate quickly; a globe is usually specified when the buyer needs a controllable stroke and a defined disc-to-seat characteristic. Upstream and downstream interfaces, representative samples and the permitted leakage class still have to be confirmed by the named supplier. This page does not treat the two constructions as drop-in substitutes.
Production stage
- Operating context
- The production stage that matters here is the piping node where flow is either shut or modulated. Continuous process lines, utility headers and bypass legs each change how often the stem moves and how much pressure drop the buyer will accept. A globe selected for throttling on a recycle line is a different RFQ from a ball selected for infrequent isolation on the same header.
| Decision point | Evidence or question |
|---|---|
| Production stage: Design input | Write whether the node needs characterized throttling, tight isolation, or both in sequence. Include fluid, working pressure, temperature, flow rate and the sample or slipstream that will be used if a factory demonstration is requested. Face-to-face length and end connection must match the existing or designed piping, not a generic catalog envelope. |
| Supplier answer | The manufacturer states whether the offered globe can be used for the written duty, or whether a ball (or another type) is being substituted. The reply should include permitted flow direction, leakage class and the documents that belong to that construction. A brochure comparison chart is not a supplier answer. |
| Open deviation | If the RFQ says globe and the reply is a floating ball without a labeled deviation, the comparison table is not aligned. The same applies when a globe is offered for isolation-only service without stating that throttling is excluded. Record the deviation before award. |