Key Functions of a Cylinder Bung
1.Accurate Valve Connection
The internal thread of the cylinder bung provides a controlled connection point for installing the cylinder valve. Thread dimensions must match the specified valve standard and customer drawing.
2.Structural Reinforcement
The bung reinforces the valve opening in the cylinder head and helps transfer loads between the valve and the cylinder shell.
3.Reliable Weld Integration
A properly designed gas cylinder neck ring provides suitable welding surfaces for integration with the upper cylinder head. Material selection and dimensional consistency are important for stable automated welding.
4.Service and Valve Replacement
The threaded connection allows the cylinder manufacturer or an authorized service facility to install or replace the valve according to approved procedures without modifying the pressure-bearing shell.
Product Features
- Forged or machined carbon-steel construction
- CNC-machined internal and external profiles
- Customized valve threads and dimensions
- Stable concentricity and dimensional consistency
- Materials selected for strength and weldability
- Suitable for automated cylinder production lines
- Inspection records and material certificates available upon request
- OEM production according to drawings or approved samples
Typical Applications
Our cylinder bungs and valve bosses can be supplied for:
Household LPG cylinders
Commercial LPG cylinders
Industrial gas cylinders
Refrigerant cylinders
Other welded steel pressure cylinders
Suitability must be confirmed against the cylinder design, gas service, valve specification and applicable regulatory requirements.
Materials and Customization
A gas cylinder neck ring is commonly manufactured from weldable carbon steel or low-alloy steel selected to match the mechanical and welding requirements of the cylinder head.
Available customization may include:
Item |
Customization options |
|---|---|
| Material | According to customer drawing or technical specification |
| Production method | Forging, bar machining or combined processing |
| Internal thread | Metric, taper or other specified valve threads |
| External profile | Customized for the cylinder-head opening and welding design |
| Dimensions | According to drawings, samples or approved specifications |
| Surface condition | Black, machined, oiled or temporary anti-rust protection |
| Documentation | Material certificate, dimensional report and inspection records |
| Packaging | Export cartons, bags, crates or palletized packaging |
Because valve-thread requirements vary by country and cylinder design, customers should confirm the complete thread designation rather than providing only the nominal diameter.
Installation in the Gas Cylinder
During cylinder production, an opening is formed in the upper cylinder head. The LPG cylinder bung is positioned in accordance with the approved cylinder drawing and welded to the head using a qualified welding procedure.
The welding method, joint geometry, heat treatment and final cylinder testing must be determined by the cylinder manufacturer according to:
- The approved cylinder design;
- Applicable national or international regulations;
- The cylinder material and wall thickness;
- The intended gas service;
- The valve and thread specifications.
After assembly, the completed cylinder-not merely the bung-must undergo the required inspections and pressure or leak tests before being released for service.
Why Choose Shanghai Luzhen?
Shanghai Luzhen SCM Co., Ltd. specializes in the international supply of steel materials, components and production support for gas-cylinder manufacturers.
Our supply capabilities include:
- Steel coils and sheets for cylinder bodies
- Cylinder bungs and valve bosses
- Valve-protection collars and foot rings
- Cylinder Valves and safety device
- Welding wire and powder coating
- Customized auxiliary materials
- Support for drawing review and supplier coordination
- Consolidated export shipment of multiple cylinder components
By sourcing compatible steel materials and cylinder components through one supply channel, customers can simplify purchasing, documentation and international logistics.
Information Required for a Quotation
To quote the correct cylinder bung or gas cylinder neck ring, please provide:
1. Product drawing or physical sample;
2. Material grade;
3. Complete internal-thread designation;
4. Key dimensions and tolerances;
5. Cylinder type and nominal capacity;
6. Applicable standard or approval requirement;
7. Required inspection documents;
8. Estimated order quantity;
9. Surface-protection and packaging requirements.
If a complete drawing is unavailable, our team can review a sample or discuss the dimensions required for initial technical confirmation.
Call to Action
Request a Cylinder Bung Quotation
Looking for a reliable supplier of cylinder bungs, LPG cylinder bungs or gas cylinder neck rings?
Send us your drawing, sample or technical requirements. Shanghai Luzhen will review the material, valve thread, dimensions, inspection requirements and order quantity before preparing a quotation.
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