Tiansu (Tianjin) Valve Group Co., Ltd. is one of the leading manufacturers and suppliers of worm gear butterfly valve in China. If you're going to buy wholesale customized worm gear butterfly valve made in China, welcome to get quotation from our factory. Quality products and reasonable price are available.

The worm gear type butterfly valve uses a worm gear mechanism for torque amplification and precise control: manually rotating the handwheel drives the worm, which turns the worm gear at reduced speed, transmitting motion to the stem. The stem, rigidly connected to the disc, drives it in a 90° rotation. When the disc plane is parallel to the pipeline axis, the butterfly valve worm gear is fully open; when perpendicular, it is fully closed, with the disc seal tightly contacting the body seat to block flow. The worm gear provides reverse self-locking, preventing disc movement from pressure fluctuations or vibration, ensuring stable locking at any position.

This carbon steel geared valve features a carbon steel body, wafer installation, and worm gear drive. It is a mainstream industrial butterfly valve type. The cast body offers high strength, pressure resistance, and moderate cost. Paired with hard (metal) seal discs, it adapts to various media. Key advantages include: compact design (flangeless, saves space), easy operation (worm gear reduction + self-lock), quick actuation (90° rotation), low flow resistance (large flow area), balancing practicality and economy. It's a top choice for medium/low-pressure systems.

Technical Parameters

Nominal Diameter: DN50 - DN600
Nominal Pressure: PN10, PN16, PN25
Operating Temp.: 0 ~ 80°C
Applicable Medium: Water

Product Application

The carbon steel geared valve suitable for municipal water/wastewater, industrial cooling water, HVAC, auxiliary power systems, petrochemical (non-strongly corrosive media), metallurgy/mining, for shut-off and flow regulation of medium/low-pressure, non-corrosive media (water, oil, standard chemicals).

Maintenance & Installation Notes

Installation Notes

Pre-installation: Check valve specs match pipeline (type, pressure, size). Clean internal debris. Ensure disc operates freely.

Pipe flanges must be parallel, spacing matching the length of butterfly valve worm gear (tolerance ≤2mm) to avoid stress/deformation.

Installation direction unrestricted (bidirectional seal). Ensure handwheel accessible. Orient worm box upward to prevent water/medium ingress.

Use gaskets suitable for medium (e.g., rubber for water, PTFE for oil). Center gasket to avoid offset and leakage.

Tighten flange bolts evenly in crosswise pattern with moderate force (avoid over-tightening damaging body or under-tightening causing leaks).

Maintenance Points

Lubrication

Check worm box every 6-12 months. Clean, apply lithium-based grease (high-temp grease for high temps). Fill to 1/2 - 2/3 capacity.

Seal Inspection

For soft-seal valves, check seals annually for wear/aging. Replace disc/seal if rubber is detached/cracked. For hard-seal valves, clean surfaces regularly; lap minor scratches.

Corrosion Protection

Apply rust-preventive paint to carbon steel body annually (or as needed). Use protective covers on exposed stem.

Operation

Rotate handwheel slowly; avoid excessive force/rapid cycling to prevent damage. After long inactivity, operate manually first to check for sticking.

Regular Inspection

Quarterly, check the position of worm gear type butterfly valve accuracy, leaks (internal/external), and for unusual noise from worm box. Address issues promptly.

Common Faults & Solutions

Common Fault

Causes

Solutions

Valve Sticking

1. Worm gear lacks lube, corroded, or contaminated.

2. Stem bent/loose connection.

3. Debris on seat.

4. Pipe flange misalignment causing deformation.

1. Disassemble box, clean, lubricate.

2. Straighten/replace stem; tighten bolts.

3. Depressurize, disassemble, clean.

4. Adjust flange parallelism, re-tighten evenly.

Internal Leakage (closed)

1. Seat worn/scratched/contaminated.

2. Soft seal aged/detached.

3. Disc deformed/eccentric.

4. Excessive worm gear play, disc not fully closed.

1. Lap seat or replace disc.

2. Replace seal with suitable material.

3. Straighten/replace disc; align concentricity.

4. Adjust limit screws to eliminate play.

External Leakage (flange)

1. Uneven bolt tightening.

2. Gasket damaged/misaligned.

3. Body flange face scratched/dirty.

1. Tighten bolts crosswise).

2. Replace and center new gasket.

3. Clean face, polish scratches.

Worm Box Oil Leak

1. Oil seal/O-ring aged/damaged.

2. Overfilled grease.

3. Box casing cracked.

1. Replace seals.

2. Drain excess grease.

3. Replace box or contact manufacturer fo crack repair.

Handwheel Spins Freely

1. Worm/gear teeth worn/broken.

2. Handwheel-stem key/pin missing/damaged.

3. Bearing/bushing damaged.

1. Replace worm gear assembly.

2. Replace and secure key.

3. Replace bearing/bushing, lubricate.

Stem Corrosion/Breakage

1. Corrosive medium, unsuitable stem material.

2. Outdoor exposure without protection.

3. Excessive torque from rough operation.

1. Replace with stainless steel stem.

2. Apply paint, add protective cover.

3. Operate correctly, avoid forceful operation.

FAQ

Q: What are the main benefits of a carbon steel valve body?

A: Carbon steel offers good mechanical strength and pressure resistance at a lower cost compared to stainless steel, making the carbon steel geared valve economical for many industrial applications where corrosion is not severe.

Q: For the butterfly valve worm gear, when should a hard-seal (metal seal) disc be chosen over a soft-seal?

A: Hard-seal discs are chosen for higher temperature applications, more abrasive media, or where longer cycle life is needed beyond the limits of elastomer seals.

Q: Why is it important to center the gasket of worm gear type butterfly valve during installation?

A: A misaligned gasket can cause uneven sealing pressure, leading to external leakage or even interfere with disc movement, causing internal damage or leakage.

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