Blanket Valves

What is tank blanketing?

The method of occupying an emptied space in a liquid storage tank with inert gas (often nitrogen). Nitrogen is generally a safe gas due to its inert properties, durability, and relatively low cost.

Importance of blanket valves

This blanket valve helps to provide safeguard to the surrounding environment instruments, equipment, and people. Blanket valves can withdraw oxygen from combustible media while stopping a fire. Other than that, blanket valves prevent oxidation, evaporation, and contamination of sustenance parts in meals. Blanket valves reduce corrosion through oxidation.

Working principle of blanket valves

The cover valve is usually located on the accumulator tank. The cover connects to the line running from the gas supply to the valve inlet mounted on the tank outlet valve. In most cases, the sensor line extends from the tank to the sensor port of the valve. When the regulator detects a drop in pressure, the valve opens and delivers more gas to the tank until the vapour pressure in the tank reaches the desired location. When the pressure reaches or exceeds the specified value, the valve moves to the closed position and returns to the return position.

When the vapour pressure in the tank drops further down than the pre-set limit, the regulator diaphragm pushes the filling lid. It allows sheets and packaging media to leak. On the cushion side, the controller responds with high-pressure vapour and pushes the cover off the seat, allowing excess vapour to escape out of the reservoir.

Material valves and drain valves can be used together. The filling valve is a discharge valve that controls the pressure inside the tank. The drain valve also controls the pressure inside the tank. The filling valve ensures uniform pressure in the tank and the gas release valve ensures that there is no excess pressure in the tank. The setting value of the fill valve is slightly higher than the setting value of the fill valve.

The average capacity of a tank depends on different types of factors such as including fluid loading and unloading, changes in temperature, admission of air and humidity to the tank, and evaporation from the tank. As the capacity changes, the space of the vapour in the tank changes.

Industries that use blanket valves

  • Chemical industries
  • Petrochemical industries
  • Food and beverage industries
  • Oil and gas refinery industries
  • Pharmaceutical industries
  • Personal care product industries
  • Semiconductor industries

Purple Engineering provide the worlds best blanket valve brands while fulfilling the requirement of the customer. Springloaded pressure reducing regulators are the blanket valves that are available in Purple Engineering.


The advantages of using Springloaded pressure reducing regulator are mentioned below,

  • Adjustable from zero pressure
  • Easy to polish
  • Easy to maintain

Some features of Purple Engineering blanket valves offer are,

  • SS 316L body
  • Balanced valve
  • Vacuum tight
  • Atex Ex II 2 GD
  • PTFE diaphragm

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