Performance Characteristics of Needle Valves with Ferrule Connections
Release date:
2022-01-11
Needle‑type valves with ferrule seals offer excellent sealing performance and long service life. Even if the sealing surfaces are damaged, only the wear‑prone components need to be replaced, allowing the valve to remain in service. During installation, the flow direction of the medium must align with the arrow marked on the valve body. Manual globe valves and ball valves can be installed at any point along the pipeline. For high‑sealing needle‑type valves, sealing performance refers to the ability of all sealing elements to prevent leakage of the process medium and is a critical technical performance parameter.
Needle‑type valves with ferrule seals offer excellent sealing performance and long service life. Even if the sealing surfaces are damaged, only the wear‑prone components need to be replaced, allowing continued operation. During installation, the flow direction of the medium must align with the arrow marked on the valve body. Manual globe valves and ball valves can be mounted at any point along the pipeline. The sealing performance of high‑seal needle‑type valves refers to the ability of all sealing elements to prevent media leakage; it is a critical technical performance parameter. A needle‑type valve comprises three sealing zones: the contact between the closing member and the valve seat; the interface between the packing and the valve stem within the stuffing box; and the joint between the valve body and the bonnet. Leakage in the first zone is termed internal leakage—commonly described as the valve failing to close tightly—which compromises its ability to shut off the medium. For shut‑off valves, internal leakage is unacceptable. The latter two types of leakage are known as external leakage, where the medium escapes from inside the valve to the outside. Such leaks result in material loss, environmental contamination, and, in severe cases, accidents. For flammable, explosive, toxic, or radioactive media, even the slightest leakage is intolerable; hence, valves must exhibit reliable sealing performance.
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