Rubber Diaphragms & Valve Seals
Custom-moulded diaphragms, valve gaskets and sealing rings for pumps, valves and piping systems that run hard, hot and around the clock.
A diaphragm flexes thousands of times a day. A valve seal must hold tight after every one of those cycles. When either fails, the result is leakage, downtime and lost product.
Bombay Rubber & Carbon Works manufactures diaphragms and valve seals in natural and synthetic rubber, plain or fabric-reinforced, and bonded to metal, plastic or PTFE where the application demands it.
We supply standard patterns and also make parts to your drawing, sample or existing OEM component, so you can keep equipment running without waiting on a single source.
Product Range
- Fabric-Reinforced Diaphragms: A fabric core keeps the rubber stable under pressure and repeated flexing, extending service life.
- Valve Diaphragms: Weir and straight-through patterns for tight shut-off in process and utility valves.
- Dome Valve Seals: Inflatable sealing rings for leak-tight isolation in continuous powder and bulk handling.
- Grooved-Coupling Gaskets: Pressure-responsive gaskets for grooved pipe joints, in grades matched to the media.
- Butterfly Valve Seats & Gaskets: Seals that guard the pipe, flange and shaft paths against leakage.
- Rubber-to-Metal Bonded Parts: Rubber bonded to metal, plastic or PTFE for strength and chemical resistance in one part.
Material Selection
| Material | Typical use | Highlights |
|---|---|---|
| Natural rubber (NR) | Water, abrasive slurries | High elasticity and tear strength |
| Nitrile (NBR) | Oils, fuels, air systems | Strong oil and abrasion resistance |
| EPDM | Hot water, steam, mild chemicals | Weather, ozone and steam resistance |
| Neoprene (CR) | General industrial, refrigerants | Balanced all-round durability |
| Silicone/PTFE-faced | Hygienic and corrosive media | Clean, wide temperature or chemical range |
Three details decide the right choice: operating temperature, the media it touches, and how hard the part works. Share these and we will recommend a grade.
Key Benefits
- Long flex life: Reinforced constructions resist fatigue, cracking and stretching.
- Tight sealing: Accurate moulding for consistent shut-off and fewer leaks.
- Chemical and heat resistance: Compounds selected for your media and operating temperature.
- Reverse engineering: Send us a worn part or drawing and we will produce a matching replacement.
- Flexible supply: Prototypes, small batches and regular production runs.
Frequently Asked Questions
What is the difference between a pump and a valve diaphragm?
A pump diaphragm moves the fluid and endures constant cycling. A valve diaphragm opens and closes the flow path and must seal tightly when shut.
Why choose fabric reinforcement?
The fabric layer holds the shape under pressure and greatly improves fatigue life.
Can you replicate an OEM part?
Yes. Send the sample or drawing and we will make a matching part.
Do you make butterfly valve and grooved-coupling gaskets?
Yes, alongside diaphragms and dome valve seals.
How do I choose the right product?
Tell us the temperature, media and duty cycle, and our team will narrow down the best design and material.
Applications
Pumps: Air-operated and mechanical diaphragm pumps, dosing and metering units.
Valves & Piping: Diaphragm, butterfly and dome valves; grooved pipe systems.
Industries: Chemical, water treatment, pharma, food, cement, power and automotive.