What are the differences between different types of gas cylinder valves?

Model 30
A gas cylinder shutoff valve is a device that shuts off the flow of gas when the pressure in a cylinder exceeds a preset level. These valves are installed between the cylinder's outlet and pressure regulator. They detect flow through a pressure drop across an internal orifice and close with a snap action to form a leak-tight seal. These valves are specifically designed for lecture bottles and are available in stainless steel, brass, and Monel.

When purchasing a gas cylinder, check the date of manufacture. It is usually stamped or permanently marked with this information. The date of manufacture should be on the cylinder, as well as the number of pressures that it is designed to hold. The cylinder is tested by applying pressure until the distance between the two compression blocks remains six times the thickness of the cylinder wall. If the pressure drops below the yield point, it may be a good sign that the cylinder is not up to snuff.

Model 62
The restraining system of a Model 62 gas cylinder valve has an additional advantage. The valve's design allows the liquefied gas cylinder to re-inflate at the same time as its other contents. A liquefied gas inflation gun is designed to push the ring 4 near the valve body 1 axis. This allows the valve to stop both the cylinder's filling and the liquefied gas inflating processes.

Model 61NRA
Air Liquide offers various types of gas valves for regulating the flow of compressed gases and gas mixtures. These valves are typically installed between the gas cylinder outlet and pressure regulator. As the gas pressure increases, the valve detects this by dropping a certain amount of pressure across its internal orifice. A snap action then closes the valve, creating a leak-tight seal. These valves are particularly well-suited for lecture bottles. They are available in brass, stainless steel, and Monel. The valve's inlet and outlet fittings are compatible with CGA-110 standards.

A Teflon packing ring is used to seal the two-piece stem of this valve. The packing ring makes contact with a ridge on the upper stem. A handwheel provides upward force, drawing the sealing ridge into the packing ring. Because of the material used, this ring can easily become contaminated in high-purity applications. It is therefore not suitable for ultra-pure gases and corrosives.

Model 62 diaphragm
The structure of the Model 62 diaphragm for a gas cylinder valve consists of the valve body, fluororesin diaphragm, and upper cover. The valve body includes a central and peripheral part that is fixed with metal bolts. The flange is designed to maintain tightening force between the diaphragm and the valve body.

The inner side of the annular portion 24 includes an upper valve body 5 forming an external ring surface 51, a tightening portion 52, and a diaphragm chamber 56. The outer edge of the body includes a ring-like portion and a shaft hole portion. Both the valve body and the diaphragm are gas-tight and installed on a gas cylinder's inlet pipe. The upper valve body is provided with a ring-shaped, external ring surface 931 and a plurality of actuation gas guide holes 174.

Model 62 packless
The Model 62 packless gas cylinder valve is a specialized valve for use with compressed gas. These valves are non-corrosive and feature a two-stage design that offers highly accurate delivery pressure control with less than 0.02/100 psi change in inlet pressure. These valves feature a CGA-nipple with a special high-purity check valve to prevent air from entering during cylinder changeout. Model 62 packless gas cylinder valve is manufactured using a highly automated process, which yields a consistently higher quality product. The valves are constructed with durable materials and have a bonnet mounted on both the front and rear panel. Stainless steel diaphragms with metal-to-metal seals provide excellent regulating characteristics. They are available in either a monel or brass