Design features
controlled disc motion moderating opening and closing transients
Final dimensions, materials, ratings and documentation depend on the approved configuration.
Check valves / LIANGGU
Slow-Opening Slow-Closing Check Valve
This model is a check valve distinguished by controlled disc motion moderating opening and closing transients. For a project quotation, share the required size, pressure designation, materials, seating, connections and quantity. Final suitability is confirmed against the approved specification.
PRODUCT DETAILS
Understand this valve.
Working principle
forward differential pressure opens the closure element; falling or reversing flow returns it toward the seat; closing behavior depends on line velocity, orientation, inertia, spring force, and the system transient; verify damping setting and minimum velocity
Typical applications
long water pipelines, pumping stations, mine water systems, and installations vulnerable to water hammer
Selection priorities
opening profile, damping setting, minimum velocity, pump rundown, surge limit, and pipeline transient model
SPECIFICATION REVIEW
Define the required configuration.
Manufacturer-listed options remain subject to the selected design and service. They are not fixed specifications for every configuration.
| Size / DN or NPS | Project-specific — include in your RFQ |
|---|---|
| Pressure designation | Project-specific — include in your RFQ |
| Common material options | Manufacturer optionCarbon steel, low-temperature steel, stainless steel, alloy steel, or another approved alloy after service and fabrication review |
| End connection & standard | Manufacturer optionFlanged or butt-welded ends, or a wafer pattern where specifically identified, matched to the approved piping class |
| Actuation & accessories | Manufacturer optionSelf-acting check function with an assisted closure or damping system engineered from the transient analysis |
| Design standards | Manufacturer optionAPI 594 may apply to flanged, lug, wafer, or butt-welded check valves; API 6D or ISO 14313 may apply to qualifying pipeline-valve service |
| Lead time & documentation | Confirmed in the written quotation |
Other materials & project configurations
Listed materials are common options, not an exhaustive range. Share the required grade and service conditions so we can review suitability, manufacturing feasibility and availability.
Catalogue information supports the enquiry. Approved technical documents define the final supply.
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