Carburetor Check Valve

Carburetor Check Valve (also called a one-way valve or non-return valve) is a critical component in a carburetor’s fuel system, typically made of durable materials like silicone, liquid silicone, nitrile (NBR), HNBR, neoprene, EPDM, FKM, FVMQ (fluorosilicone) etc. Shaped like an umbrella or mushroom, carburetor check valve ensures fuel flows in a single direction within the fuel system, preventing backflow and maintaining proper pressure.

Carburetor Check Valve Structure

Mushroom Shaped Diameter: bigger than one-way valve holes

Hook Height: same to plastic & metal panel's height

Stem Diameter: same or maller than assembly holes

Outside Diaphragmatic Surface: EDM process or texture surface for dust proof

Inside Diaphragmatic Ring Edge Surface: Polish or high-polishing for sealing function

Carburetor Check Valve Design Guide

Carburetor One Way Valve usually has undercut design structure, which should be made of material with high tensile elastic manuafctured by three-plate mold for avoiding damage when ejected valve from mold. But FPM & Fluorosilicone (FVMQ) material don't have so excellent high tensile property compared with Silicone Rubber material. When we design the valve, we usually make larger radius around the undercut for helping easier demoulding.

Carburetor Check Valve Working Principle

Forward flow: During engine operation (intake stroke), fuel/air pressure opens the valve.

• Reverse sealing: When pressure drops or reverses, the valve closes automatically, blocking backflow.

Carburetor Check Valve Manufacturing Process

Carburetor Check Valve Key Functions

1. Motorcycle/car carburetors: Prevents fuel backflow for reliable starting.

• 2. Small gasoline engines (lawnmowers, generators): Stabilizes fuel delivery.

• 3. Evaporative Emission Control (EVAP): Reduces hydrocarbon emissions.

Umbrella Valves in Stock

Why Choose Us?

1. Decades of experience about precision silicone rubber molding production.

2. We can offer high precises designs and sizes for silicone rubber valves to support your devices according to your 3D/2D drawings,samples, flowing parameters etc.

3. We have Dust-Free Silicone Rubber Compression Molding Plants and Dust-Free Dismantling Plants. 

4. According to customer demands, most of silicone medical parts should be produced and finished in clean room.Our dust-free plants can up to 100,000 stage.