Pipeline isolation
Compare KEHUA gate valves from a China manufacturer. Review cast or forged bodies, bonnet and stem options, isolation duty and project quotation requirements.
API 600 / API 6D
Use the gate valve catalogue to define isolation duty and shortlist body, bonnet and stem features independently. Cast or forged construction, pressure-seal bonnets, stem travel and low-temperature requirements can overlap; the series names are not mutually exclusive pressure grades. Follow each series link for the drawing and quotation checks relevant to your installation.
SERIES SELECTION COMPARISON
Start with full-open or full-closed isolation duty, then review body manufacture, bonnet joint, stem movement and any low-temperature requirement independently. These gate valve features can overlap; the series names are not mutually exclusive pressure grades. Confirm the required combination, materials, bore, ends and installation envelope on one offered drawing rather than assuming every combination is available.
No. Cast or forged identifies body manufacture, not the complete gate valve pressure rating or a guaranteed full-bore passage. Compare the actual casting or forging grade, wedge and seat trim, bore and pipe ends against the piping specification. Request the offered dimensions and configuration-specific pressure-temperature limits before approving the order.
They address different requirements. A pressure-seal bonnet needs review of its joint, assembly, thermal cycles and maintenance access. A low-temperature extension needs the specified fluid phase, minimum temperature, orientation and test scope. Review each required feature on the complete offered gate valve; neither description substitutes for a model-specific service rating.
Compare the rising stem's fully open height and exposed-stem protection with the non-rising arrangement's position indication and stem-nut maintenance. Request open, closed and operator envelopes for the actual installation. A non-rising stem does not eliminate handwheel, gearbox, actuator or maintenance-space requirements, and neither arrangement identifies the body's pressure-temperature limits.
Use these decisions to compare existing catalogue constructions, not to assume interchangeability. Confirm medium suitability, size, pressure, temperature, materials and connections on the offered model’s datasheet and drawing.
TECHNICAL SELECTION
Use the sample catalogue figures as a starting point, not a universal rating. Confirm the exact model, size, pressure class, material, end connection and operating conditions on an approved datasheet before ordering.
Define full-open/full-closed isolation duty with medium, solids and corrosion concerns. Sustained throttling requires separate engineering review of the offered model.
Specify DN/NPS, bore, face-to-face length, full stem travel and maintenance access; review the actual end and assembly drawings.
Give normal/design pressure and temperature, maximum differential pressure and startup/shutdown conditions. State any minimum-temperature qualification separately.
Identify flange facing/drilling, weld or other offered end preparation and the piping standard. Body, bonnet and stem labels do not determine the mating interface.
The figures describe the named catalogue construction. Size, pressure, temperature, material and end options are not interchangeable combinations; the maximum values do not apply simultaneously. Confirm the offered configuration, seat/seal compatibility, pressure–temperature limits and dimensions on its approved datasheet and drawing. The listed ranges summarize catalogue sizes, not every intermediate DN.
| Pressure class | Nominal sizes shown | End styles shown | Printed pages |
|---|---|---|---|
| ASME Class 150 | NPS 2–48 / DN 50–1200 | RF / RTJ flange · BW | 03 |
| ASME Class 300 | NPS 2–48 / DN 50–1200 | RF / RTJ flange · BW | 04 |
RF = raised-face flange · RTJ = ring-joint flange · BW = butt-weld end
Source: supplied valve sample booklet; page numbers refer to its printed pages. Confirm the current model datasheet before ordering.
These are model- and class-specific examples. Not every size or end style is available in every configuration; final dimensions and ratings require an approved drawing and datasheet.
GATE VALVE MANUFACTURER & PROJECT SELECTION
KEHUA VALVE is Wenzhou Kehua Valve Co., Ltd., an industrial valve manufacturer in Wenzhou, Zhejiang, China. This catalogue brings together cast steel, forged steel, pressure seal, rising stem, non-rising stem and cryogenic or extended-bonnet gate valve series for project isolation review. These labels describe different construction features; they are not six mutually exclusive configurations.
Review the KEHUA valve manufacturer profileCompare the required body and trim materials, nominal size and actual flow bore. Cast and forged describe manufacture of the body; confirm the complete valve drawing and pressure–temperature limits for the quoted configuration.
Specify the required bonnet construction separately from body material. For a pressure seal gate valve, review the bonnet seal, assembly procedure, startup and shutdown conditions, and inspection access; the bonnet name alone does not establish a pressure class.
Compare rising and non-rising stem arrangements against the available operating envelope. Request fully open and closed dimensions, position indication and maintenance access. A non-rising stem still requires verification of the actual opening indication and clearance.
For a cryogenic or extended-bonnet gate valve, also confirm the minimum design temperature, extension dimensions, material suitability and required test scope. Define full-open or full-closed isolation duty; sustained throttling needs a separate review of the offered model and operating conditions.
Cryogenic and extended-bonnet gate valvesProvide the fluid and solids content, design and operating pressure and temperature, maximum differential pressure, nominal size and required bore, end-connection standard, bonnet and stem arrangement, quantity and inspection requirements. Request the offered model's drawing, materials and agreed shell and seat test conditions so that quotations can be compared on the same basis.
Pipeline isolation
Use the gate valve page when the buyer needs low pressure drop and full-open or full-closed service.
A wedge gate moves across the flow passage to isolate the line. Cast steel identifies body manufacture; the wedge, bonnet joint and stem arrangement are separate choices. Define full-open or full-closed service before specifying the trim.
Cast wedge
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A forged gate valve uses a forged pressure-containing body. Nominal size, actual bore and end preparation remain model-specific. A compact forged design should not automatically be described as full bore.
Forged compact
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Pressure seal identifies the bonnet-joint sealing arrangement. Body manufacturing method, gate design and stem travel remain separate specifications. Review assembly and seal behavior through startup, normal operation and shutdown.
Pressure seal bonnet
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A rising-stem arrangement changes the external stem position during operation. Check the full-open height and protection of the exposed stem against the installed layout, not just the closed-valve dimensions.
Rising stem
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A non-rising stem avoids external stem travel during operation. It does not remove the need for position indication, stem-nut maintenance or operator clearance; establish these requirements on the offered assembly drawing.
Non-rising stem
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An extended bonnet is one part of a low-temperature gate valve specification. The extension, materials, stem sealing and required cold tests must be reviewed together for the stated minimum temperature and installation orientation.
Cryogenic / extended bonnet
Request this seriesTechnical data
Prepare a gate valve schedule with the required body/trim, bonnet, stem arrangement, bore, ends and operation identified by line item. Include quantities, destination, requested date, drawing approvals and inspection records. Ask suppliers to confirm the proposed configuration and disclose deviations rather than price an unspecified family range. Use the line-item RFQ checklist and quality-document review to define the requested submission package. Unknown values can remain open for technical confirmation.
BUYER GUIDES
Use these guides to compare valve types, body materials and RFQ requirements before requesting a project quotation.
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