pressure cooking primarily involves two main types of pressure weights or pressure regulators: weighted and spring-loaded.
Weighted Pressure Regulator (Jiggler or Whistler): This type of pressure weight is a simple, traditional design often called a "jiggler" or "whistler" due to the noise it makes when regulating pressure. It consists of a small weight that sits on the vent pipe of the pressure cooker. As pressure builds up inside the cooker, steam is forced through a small hole in the weight, causing it to jiggle or emit a whistling sound. The speed and frequency of the jiggling or whistling indicate the pressure level inside the cooker. Different holes or settings on the weight can be used to achieve different pressure levels.
Spring-Loaded Pressure Regulator: More modern pressure cookers often use a spring-loaded pressure regulator. This type of pressure weight is a bit more complex in design but offers more precise control over the pressure level. It consists of a spring-loaded valve that releases steam when pressure inside the cooker exceeds a set level. The spring is calibrated to allow steam to escape until the desired pressure is reached, at which point it closes to maintain the pressure. Some spring-loaded pressure regulators may have multiple pressure settings to choose from, giving you more flexibility when cooking different types of food.