Overview
Tank Blanketing Valves provide an effective means of preventing and controlling fires in flammable liquid storage tanks. Vapors cannot be ignited in the absence of an adequate supply of oxygen. In most instances, this oxygen is provided by air drawn into the tank from the atmosphere during tank emptying operations.
Tank Blanketing Valves are installed with their inlet connected to a supply of pressurized inert gas (usually Nitrogen), and their outlet piped into the tank’s vapor space. When the tank pressure drops below a predetermined level, the blanketing valve opens and allows a flow of inert gas into the vapor space. The blanketing valve reseals when pressure in the tank has returned to an acceptable level. The blanketing gas contains no air. No supply of air (Oxygen) is allowed to enter the tank. The vapors, therefore, never form a flammable mixture.
Tank Blanketing Valves help maintain the vapor space in a non-flammable condition, and also provide make-up gas to insure that the tank’s vapor space is not subjected to a vacuum.
Pilot Operated Tank Blanketing Valve – 2″
Protectoseal Series No. 10, Pilot Operated Tank Blanketing Valve, is designed to regulate the flow of a blanketing gas (usually Nitrogen) into the vapor space of a flammable liquids storage tank. The valve senses the pressure in the vapor space and opens to allow a flow of gas into the tank when the pressure drops below its set point. When tank pressure returns to the valve’s set point, the flow of gas is stopped.
The Series No. 10 valve consists of a main valve (which controls the flow of inert gas into the tank), and the pilot valve (which accurately senses the tank’s pressure and controls the opening and closing of the main valve). This tandem valve arrangement provides extremely accurate control of the flow of gas into the tank. The pressure balanced poppet in the pilot ensures that a consistent opening set pressure is realized over the range of allowable inert gas supply pressures. The Series No. 10, Pilot Operated Tank Blanketing Valve, requires a very small band of pressure to cycle from closed, to open and fully flowing, to resealed.
Protectoseal Series 10 Specifications
Pilot Operated Tank Blanketing Valve – 1″
Protectoseal Series No. 20, Pilot Operated Tank Blanketing Valve, is designed to regulate the flow of a blanketing gas (usually Nitrogen) into the vapor space of a flammable liquids storage tank. The valve senses the pressure in the vapor space and opens to allow a flow of gas into the tank when the pressure drops below its set point. When tank pressure returns to the valve’s set point, the flow of gas is stopped.
The Series No. 20 valve consists of a main valve (which controls the flow of inert gas into the tank), and the pilot valve (which accurately senses the tank’s pressure and controls the opening and closing of the main valve). This tandem valve arrangement provides extremely accurate control of the flow of gas into the tank. The pressure balanced poppet in the pilot ensures that a consistent opening set pressure is realized over the range of allowable inert gas supply pressures. The Series No. 20, Pilot Operated Tank Blanketing Valve, requires a very small band of pressure to cycle from closed, to open and fully flowing, to resealed.
Protectoseal Series 20 Specifications
Spring Operated Tank Blanketing Valve – 1/2″
Protectoseal Series No. 30, Spring Operated Tank Blanketing Valve, is designed to regulate the flow of a blanketing gas (usually Nitrogen) into the vapor space of a flammable liquid storage tank or vessel. The Series No. 30 valve is spring operated. The pressure balanced poppet is held in its closed position by direct spring force. The tank’s vapor space pressure is sensed in the diaphragm case and the valve opens to allow a flow of gas into the tank when the pressure drops below its set point. When tank pressure returns to an acceptable level, the flow of gas is stopped.
The pressure balanced valve poppet ensures that a consistent opening set pressure is realized over the range of allowable inert gas supply pressures. The Series No. 30 valve is suitable for use on smaller tanks and vessels. Standard 1/2″ NPT inlet and outlet connections are provided.