Tiansu (Tianjin) Valve Group Co., Ltd. is one of the leading manufacturers and suppliers of grooved rising stem gate valve in China. If you're going to buy wholesale customized grooved rising stem gate valve made in China, welcome to get quotation from our factory. Quality products and reasonable price are available.
The grooved gate valve controls fluid flow by raising or lowering a gate. Rotating the handwheel clockwise drives the stem via threads to lower the gate until it seals against the seat, blocking flow. Counter-clockwise rotation lifts the gate, creating a clear passage. Its rising stem design provides direct visual indication of valve position, as the stem extension corresponds to gate travel. This helps prevent leaks or flow issues due to improper closure.
Product Core Parameters
- Nominal Diameter: DN50-DN300(DN50 refers to the 2 inch rising stem gate valve)
- Nominal Pressure: PN10, PN16, PN25
- Operating Temperature: 0～80℃
- Applicable Medium: Water
Product Application
The rising stem grooved gate valve is widely used in fire protection, water supply, and drainage pipeline systems, offering a combination of easy installation and operational safety.
Maintenance & Installation Notes
Installation & Usage Notes
Preparation
Verify valve model, size, and pressure rating of the grooved gate valve match the pipeline. Clean debris/burrs from pipe grooves; ensure gaskets are intact (no damage/aging).
01
Connection
Align valve ends with pipe grooves, seat gaskets properly, wrap couplings uniformly, and tighten bolts symmetrically to avoid body distortion.
02
Location
Select an accessible location with sufficient handwheel clearance (≥20cm). Install with stem upward; never invert or tilt, as this affects stem movement.
03
Operation
Rotate the handwheel of rising stem grooved gate valve slowly; avoid forceful turning. After full opening, close back ¼ turn to prevent gate seizure.
04
Pressure Test
After installation, perform a hydrostatic test at 1.5 times rated pressure for 60 seconds; no leakage qualifies. Ensure valve is fully open and air is purged before testing.
05
Maintenance Points
Routine (Monthly)
Wipe body surface; check for smooth operation and coupling bolt tightness; inspect joints for leaks.
Quarterly
Lubricate stem and handwheel pivots; inspect gasket condition - replace if aged/damaged.
Annual
Disassemble to inspect gate/seat wear; clean internal cavity; apply anti-corrosion coating (e.g., rust-preventive paint) where needed.
Long-term Storage
Close upstream/downstream isolation valves, drain fluid, apply anti-rust oil, install protective caps, and store in a dry, ventilated area.
Common Failures & Solutions
|
Common Failure |
Causes |
Remedies |
|
Valve Leakage |
1. Gasket damaged/misaligned; 2. Coupling bolts unevenly tightened; 3. Gate sealing surface worn. |
1. Replace gasket and install correctly; 2. Tighten coupling bolts symmetrically and evenly; 3. Polish minor wear; replace gate if severe. |
|
Stem Movement Stiffness |
1. Stem rusted/insufficient lubrication; 2. Debris jamming gate; 3. Thread mechanism worn. |
1. Clean stem and apply designated lubricant; 2. Operate slowly to flush debris; disassemble and clean if necessary; 3. Replace worn threads or stem. |
|
Unable to Visually Judge Position |
1. Stem scale faded; 2. Rising stem mechanism jammed, causing abnormal travel. |
1. Re-mark stem scale; 2. Troubleshoot jamming (debris, rust); repair to ensure smooth stem movement. |
|
Coupling Loosening & Leakage |
1. Bolts insufficiently tightened; 2. Pipe groove dimensions incorrect. |
1. Re-tighten bolts symmetrically; 2. Check groove dimensions; replace coupling or adjust pipe. |
FAQ
Q: What is the primary installation advantage of a grooved gate valve compared to flanged valves?
A: The grooved connection system allows for faster, tool-light installation without welding or threading, significantly reducing labor time and cost in systems like fire protection lines.
Q: How does the rising stem grooved gate valve design help in maintenance inspections?
A: The externally visible stem moves up and down with the gate, providing an immediate, at-a-glance indication of whether the valve is fully open, fully closed, or at an intermediate position, facilitating quicker status checks.
Q: Can a standard 2 inch rising stem gate valve coupling be used if the pipe groove is slightly worn?
A: No. The installation of a 2 inch rising stem gate valve relies on a precise and secure connection. Using a coupling on a worn or out-of-specification groove can compromise the seal and joint integrity, which may lead to leaks or valve operation issues. Therefore, always verify that the pipe groove dimensions conform to standards before installing the valve and its corresponding coupling.
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