Tiansu (Tianjin) Valve Group Co., Ltd. is one of the leading manufacturers and suppliers of rising stem flanged gate valve in China. If you're going to buy wholesale customized rising stem flanged gate valve made in China, welcome to get quotation from our factory. Quality products and reasonable price are available.
The carbon steel flanged gate valve is a common shut-off valve in industrial pipelines. It uses carbon steel for the body, a flanged connection, and a rising stem design. Valves like the carbon steel rising stem gate valve offer cost-effectiveness and clear operational feedback.
The rising stem is a key feature: the stem moves externally with the gate, allowing visual position verification and keeping the threads away from the medium to reduce corrosion. The flow path is nearly straight, minimizing pressure drop and saving pumping energy. Full-bore designs permit passage of pipeline cleaners.
The body often uses WCB carbon steel for good strength and economical cost, handling medium-high pressures and thermal shock. The stem may use 2Cr13 stainless steel for better wear and corrosion resistance. The design often features a flexible gate for improved sealing via elastic compensation. Sealing surfaces are often hard-faced with stainless steel or alloy. The carbon steel flanged rising stem gate valve uses flanged ends for easy installation/removal and reliable sealing.
Product Core Parameters
- Nominal Diameter: DN50-DN200
- Nominal Pressure: PN10, PN16, PN25, PN40
- Operating Temperature: 0～80℃
- Applicable Medium: Water
Product Application
Carbon steel flanged gate valve is suitable for petroleum, chemical, power, metallurgy, municipal water, and drainage industries. Used for fluid flow isolation in medium/high-pressure pipelines, especially where visual status confirmation is needed.
Operating Principle
When closed, sealing can rely on medium pressure pressing the gate against the seat (self-sealing). The carbon steel rising stem gate valve moves linearly with the stem. A trapezoidal thread on the rising stem engages a top nut, converting rotary torque to linear thrust. Full opening is reached when the gate travel equals the nominal bore. The stem's top position indicates "fully open." To prevent thermal locking, carbon steel flanged rising stem gate valve is common to open fully then back off ½-1 turn. Thus, the full-open position is defined by gate travel.
Maintenance & Installation Notes
1. Installation Notes
Preparation
Confirm valve model, PN rating, size matches pipeline (e.g., Z41H-16C for PN16, non-corrosive media). Check body/flange faces for scratches/rust, ensure stem moves freely, gaskets are intact. Clean pipe flange faces.
Position & Direction
Prefer horizontal installation with stem vertical upward, allowing ≥25cm operational space. Do not install inverted or tilted. No flow direction restriction, but follow body arrow if present.
Flange Connection
Align bolt holes, center gasket. Tighten bolts symmetrically and evenly to uniform torque. Bolts should protrude 2-3 threads.
Pressure Test & Commissioning
Hydrostatic test at 1.5x rated pressure for 60 sec, no leaks. Pressurize slowly, bleed air. Do not strike valve under pressure. Cycle valve fully open/closed 1-2 times to confirm smooth operation.
2. Usage Notes
Operation
Turn handwheel slowly; avoid force. After full open, close back ¼ turn. Do not over-tighten when closing. Use stem extension to confirm position.
Media & Conditions
For water/non-corrosive media only. Do not use with strong acids/alkalis. Do not exceed rated temperature/pressure.
Troubleshooting
If stem sticks, do not force; try lubricant. If persists, inspect for debris/rust. For leaks, tighten flange bolts first; replace gasket or repair seat if needed. Isolate and depressurize before repair.
Prohibited
Do not hang weights on valve, strike body/handwheel, use cheater bars on handwheel, or disassemble under pressure.
3. Maintenance Schedule
Monthly
Clean body, flanges, handwheel; check for leaks, loose bolts; ensure stem moves smoothly.
Quarterly
Lubricate stem threads and pivots with industrial grease (e.g., lithium-based); inspect/replace aged gaskets; clean exposed stem.
Annually
Disassemble to inspect gate/seat surfaces; polish minor wear, replace if severe; clean internal cavity; derust and paint carbon steel (epoxy primer + polyurethane topcoat); re-test after reassembly.
Long-term Storage
Isolate, drain, apply anti-rust oil to stem/threads, install protective caps, store in dry, ventilated area.
Common Failures & Solutions
|
Common Failure |
Causes |
Remedies |
|
Flange Joint Leakage |
1.Gasket aged/damaged; 2.Bolts unevenly tightened; 3.Flange face scratched/contaminated. |
1. Replace with suitable gasket (e.g., compressed asbestos, spiral-wound); 2. Tighten bolts evenly to uniform torque; 3. Clean face, polish light scratches with fine sandpaper; repair face if severe. |
|
Stem Movement Stiffness |
1. Threads corroded/ dry; 2. Debris in cavity jamming gate; 3. Stem bent/threads worn. |
1. Clean threads, apply lithium grease; 2. Operate slowly to flush; disassemble and clean if needed; 3. Straighten or replace bent stem; replace if threads are worn. |
|
Handwheel Hard to Turn |
1. Stem threads corroded; 2. Gate jammed; 3. Handwheel or drive damaged. |
1. Apply penetrating oil, then lubricate; 2. Disassemble to clear obstruction; 3. Replace damaged handwheel or parts. |
|
Unclear Stem Scale/Position |
1. Stem rusted/paint gone; 2. Stem movement abnormal (sticking/bent). |
1. Derust and re-mark scale (clearly indicate full-open/close); 2. Troubleshoot cause (jamming/bending), repair for smooth travel. |
|
Body Corrosion & Leakage |
1. No corrosion protection on carbon steel; 2. Medium contains corrosive elements; 3. Outdoor exposure without shelter. |
1. Derust, apply epoxy primer + polyurethane topcoat; 2. Use corrosion-resistant valve (e.g., stainless) or add upstream protection; 3. Install protective cover for outdoor valves. |
FAQ
Q: What are the typical corrosion protection measures for a carbon steel flanged gate valve used outdoors?
A: External surfaces should be thoroughly cleaned, primed with an epoxy coating, and finished with a polyurethane topcoat. Regular inspection for coating damage is essential, and any exposed metal should be repromptly treated to prevent rust.
Q: Why should a carbon steel rising stem gate valve not be used for flow throttling?
A: Throttling creates high-velocity, turbulent flow across the partially open gate and seat, leading to rapid erosion of the sealing surfaces, vibration, and eventual leakage. It is designed strictly for full open or full closed service.
Q: How often should the exposed stem threads of a carbon steel flanged rising stem gate valve be lubricated?
A: Under normal service conditions, lubrication with a suitable industrial grease (e.g., lithium-based) should be performed quarterly. In dusty, wet, or high-cycle applications, more frequent lubrication may be necessary.
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