Quick answer

Replace the gasket on a Kuhn Rikon Duromatic pressure cooker when it becomes hard, cracked, or no longer seals steam. Replace the valve if it sticks, leaks continuously, or fails to regulate pressure. Always use original Kuhn Rikon spare parts matched to your cooker's diameter and model. The process takes about 15–20 minutes and requires no special tools beyond a screwdriver for handle screws.

Signs your gasket or valve needs replacing

A worn gasket is the most common reason a pressure cooker stops building pressure. Look for a sealing ring that feels stiff instead of pliable, shows visible cracks or flattening, or has changed color significantly. If steam escapes around the lid rim during cooking, the gasket is likely the culprit. Valves rarely fail silently: a valve that hisses constantly, sticks in one position, or doesn't release pressure when turned indicates replacement is due. Handle screws loosen over time; if the lid handle wobbles, tighten or replace the screws before they strip.

Match the part to your Duromatic model and size

Kuhn Rikon pressure cookers come in different diameters (20 cm, 22 cm, 24 cm, 28 cm, etc.) and series such as Duromatic Supreme, Duromatic Classic, and Duromatic Inox. A gasket or lid handle screw for one size will not fit another. Check the diameter stamped on the base of your cooker or measure across the rim. For example, the DUROMATIC® SUPREME complete lid with handle is designed for 20 cm pots, while the DUROMATIC® CLASSIC NEO lid handle screws fit 20/22 cm models. Using the wrong size leads to leaks or a loose handle.

Step-by-step replacement

Work on a cool, clean cooker. Remove the old gasket by gently prying it out of the lid groove with your fingers or a blunt tool. Do not use a sharp knife that could scratch the sealing surface. If you are replacing the valve, unscrew the old valve assembly and note how the spring and pin are oriented. For handle screws, hold the handle steady and unscrew one screw at a time to avoid misaligning the lid. Install the new gasket by pressing it evenly into the groove, ensuring it sits flat with no twists. Hand-tighten valve parts; do not overtighten, as this can damage the sealing surfaces. After reassembly, test with a small amount of water before cooking a full meal.

Step-by-step: replacing gasket, valve, and handle screws

  1. 1. Identify the part and model: Check the diameter on the cooker base and the series name (e.g., Duromatic Supreme, Classic, Inox). Order the matching gasket, valve, or screw set. Common mistake: guessing the size. A 22 cm gasket will not seal a 20 cm lid.
  2. 2. Remove the old gasket: With the lid off and cool, gently pull the gasket out of its groove. Inspect the groove for food residue and wipe clean with a damp cloth. Checkpoint: the new gasket should sit flush and not pop out when you run a finger around it.
  3. 3. Replace the valve (if needed): Unscrew the old valve assembly, noting the order of spring and pin. Install the new valve finger-tight. Do not force it. Common mistake: overtightening the valve, which can deform the seal and cause leaks.
  4. 4. Tighten or replace handle screws: If the handle is loose, tighten screws evenly. If threads are stripped, replace with new screws for your model size (e.g., 20/22 cm). Checkpoint: the handle should feel solid with no side-to-side play.
  5. 5. Test before cooking: Add 2 cups of water, lock the lid, and bring to pressure. Listen for continuous steam leaks. If leaking, reseat the gasket or check valve tightness. If it still leaks, the gasket may be the wrong size or the valve may need replacement.

Genuine Kuhn Rikon spare parts