คำอธิบาย
Full-bore stainless steel isolation valve
วาล์วประตูลิ่มสแตนเลส
A rising-stem gate valve for fully open or fully closed service in process piping, available with material, trim, end and operator selections matched to the piping specification.
What is a stainless steel wedge gate valve?
A wedge gate valve controls flow by raising or lowering a wedge-shaped closure member between two seats. In the fully open position, the flow path is substantially unobstructed, making the design suitable for isolation where low pressure drop is important.
Flexible wedges can accommodate limited seat alignment and temperature effects better than a rigid solid wedge in many services. Gate valves are not normally selected for throttling because partial opening can cause vibration, seat erosion and damage to the wedge or guides.
Wedge gate valve specifications
| ผลิตภัณฑ์ | Stainless steel wedge gate valve |
|---|---|
| การก่อสร้าง | Bolted bonnet or pressure seal when separately designed and ordered |
| Wedge options | Flexible wedge or solid wedge according to design and service |
| Stem arrangement | Outside screw and yoke, rising stem |
| Body materials | ASTM A351 CF8/CF8M/CF3/CF3M; duplex or nickel alloy by specification |
| Trim and seating | Stainless/alloy trim with integral, renewable or hardfaced seats as ordered |
| Pressure rating | ASME Class or PN rating verified against material and temperature |
| End connections | รฟ, RTJ or butt-weld ends according to design |
| Operation | Handwheel, gearbox, electric, pneumatic or hydraulic actuator |
| Optional features | Lantern ring, live-loaded packing, bypass, ท่อระบายน้ำ, locking and emissions-qualified packing when specified |
| เอกสารประกอบ | Material records, pressure test report, GA drawing and inspection dossier as ordered |
The table describes typical engineered supply options, not a universal stock range. Final size, pressure-temperature rating, trim, seat, operator and end connection must be confirmed against the purchase specification and applicable code edition.
Stainless steel and alloy material options
| ตระกูลวัสดุ | Common cast designations | Typical selection basis |
|---|---|---|
| Austenitic stainless steel | ASTM A351 CF8, CF8M, CF3 and CF3M | ความต้านทานการกัดกร่อนทั่วไป; CF8M/CF3M adds molybdenum for improved chloride resistance. |
| Duplex stainless steel | ASTM A995/A890 4A and related 2205 เกรด | Higher strength and improved chloride stress-corrosion resistance when properly specified. |
| Super duplex stainless steel | ASTM A995/A890 5A or 6A | น้ำทะเล, offshore and high-chloride service subject to temperature and fabrication controls. |
| Nickel alloy | ASTM A494 grades matching C276, อัลลอย 20, Monel or other ordered chemistry | Selected from actual process chemistry, ความเข้มข้น, temperature and contamination data. |
ออกแบบ, testing and project compliance
API 600
Common design basis for bolted-bonnet steel gate valves. วัสดุ, trim, ความหนาของผนัง, testing and marking are tied to the ordered edition.
ASME B16.34
Defines pressure-temperature and general valve design requirements within its scope.
API 598
Provides common shell, backseat and closure pressure-test requirements when specified.
API 624 / ISO 15848-1
Fugitive-emission qualification applies only to the qualified stem packing system and valve design.
Standards are supplied only when stated in the quotation and purchase order. Fire-safe, fugitive-emission, sour-service, cryogenic and PED requirements require a defined design and supporting qualification or documentation.
การใช้งานทั่วไป
| อุตสาหกรรม | หน้าที่ปกติ | Selection focus |
|---|---|---|
| การแปรรูปทางเคมี | Main process-line isolation | Corrosion-compatible pressure boundary, trim and packing |
| ปิโตรเคมี | Unit isolation and block duties | Fire-safe philosophy, emissions and pressure class |
| การผลิตกระแสไฟฟ้า | น้ำ, steam auxiliaries and chemical systems | Temperature rating, trim and operating torque |
| Marine and offshore | Utility and selected seawater systems | Duplex material, external corrosion and actuation |
Application examples are not a service approval. The end user or piping materials engineer must verify corrosion compatibility, pressure-temperature limits, emissions class, operating frequency and applicable regulations.
Inspection and supply documentation
EN 10204 3.1 material records and heat-number traceability when ordered.
Shell and closure/seat testing to the ordered standard with documented acceptance criteria.
Positive material identification and PT/RT/UT scope arranged when specified in the inspection plan.
ขนาด, การทำเครื่องหมาย, operation, coating/cleanliness, packing and document dossier checked before dispatch.
รายการตรวจสอบ RFQ
- API/ASME/EN design standard and edition
- Nominal size and pressure class or PN
- Body, bonnet, wedge, stem, seat, packing and bolting materials
- Flexible wedge or solid wedge
- รฟ, RTJ or butt-weld end details
- Manual or actuated operation
- ของไหล, design pressure and design temperature
- Emissions, เนซ, fire-safe philosophy and inspection requirements
คำถามที่พบบ่อย
Should a wedge gate valve be used for throttling?
ปกติไม่มี. A wedge gate valve is intended for fully open or fully closed isolation. Extended partial opening can cause unstable flow, vibration and damage to seating surfaces.
What is the difference between a flexible and solid wedge?
A flexible wedge has controlled flexibility that can accommodate limited seat-angle and thermal effects. A solid wedge is more rigid. The project specification and service determine the correct choice.
What does OS&Y mean?
Outside screw and yoke means the stem threads are outside the pressure boundary. With a rising-stem arrangement, stem movement also provides visual position indication.
Can duplex stainless steel be supplied?
ใช่, subject to the required cast grade, การรักษาความร้อน, การทดสอบการกัดกร่อน, trim compatibility, welding controls and pressure-temperature rating.
Which documents should be specified?
ข้อกำหนดทั่วไปได้แก่ EN 10204 3.1 material records, pressure test reports, พีเอ็มไอ, dimensional inspection and GA drawings. Project-specific NDE and third-party witnessing should be stated at inquiry stage.
Request a wedge gate valve quotation
Provide the design standard, ขนาด, ระดับ, วัสดุ, wedge, ends, operating conditions and documentation requirements.
