All You Need To Know About Globe Valves

Globe valves are valves with a globular body with a linear motion valve. The shape of the body has changed, though the function principle remains the same. Globe valves offer precise throttling ability for high pressure systems which is advantageous for some uses. The low flow coefficient is the biggest disadvantage for some users when the valve operating time is longer and the operator has to manually check whether the valve is completely open or closed.  Globe valves are widely used in systems that run on a wide range of temperatures, systems that require frequent stroking and vacuum.

Globe valves are used for gas as well as liquid systems. They are not advisable to be used for slurry systems as the material may become entrapped in the cavity and disable the valve operations. They can be used in a variety of applications as long as the pressure and temperature are within the limits. The space between the disk and the seat changes which allows the liquid to flow. Sometimes the direction of the flow changes which causes a change in pressure. To help maintain a tight seal, the globe valve is installed with a vertical stem and fluid stream connected to the pipe above the disk.

The globe valve is used where the flow or the pressure is to be controlled in a system. The globe valve can be operated in any position between open and close that offers precision control. This is possible due to the perpendicular movement of the disk away from the seat. The gradual change in the spacing allows the operator to precisely control the flow. 

Construction of the Globe valve

The globe valve is designed in three body types: angle design, Y-design and Z-design.  The trim consists of a disk and seat ring. The disk lowers into the seat in the center of the valve to stop the flow. The position of the disk in relation to the seat allows or restricts the flow. The handwheel and disk are connected by a stem which is threaded and fits in the valve bonnet.  The seat of the globe valve may be integrated or screwed into the body of the valve. The valve is open or closed by the valve actuator which operates the stem and disk.

Advantages of Globe Valve

• The brass globe valve is highly durable and safe
• Fast acting
• The control of flow is precise
• Can be easily used in high pressure systems

Disadvantages of Globe valves

• The opening of the disk assembly is large
• There is high head loss
• Globe valve is much heavier than other valves
• The coefficient of flow is low
• The mounting of the disk on the stem is cantilevered

Read More Here All You Need To Know About Globe Valves

Applications of Oxygen regulators for different industries

Oxygen regulators which are mainly the valves can control the oxygen flow from the tank to delivery instrument or the outlet. The main applications include medicinal, scuba diving for exploration and sports or industrial purposes. The oxygen regulator valve cuts the high pressure oxygen flow by allowing some amount of controlled gas for reaching the outlet of any instrument. 

Considering the case of cutting or welding for industrial applications, the oxygen valve will helps to regulate the oxygen flow up to the torch such that steady flame is produced for cutting. If oxygen is required in scuba equipment and breathing in hospitals, the regulator valve regulates flow as the breathing of high pressure oxygen may be fatal. 

The Method

There are continuous and non-continuous oxygen flow regulators for oxygen gas which regulates pressure of oxygen contained in the tank. This uses downstream pressure of gas to regulate it which allows the spring for balancing the force. It’s attached to the valve to enable it close or open as per the gas pressure. The diaphragm when attached to valve system along the spring controls the gas pressure to allow certain gas amount for passing through the instrument. 

Function

The oxygen valve regulates the gas pressure but isn’t only the gas flow regulator. The 3 parts mainly include sensing, loading and control mechanism. The loading technique will determine the pressure setting, allowed mainly to pass through the regulator. It’s done on using the pre-tensioned spring. Following is sensing method which senses the pressure amount to set it for adequate delivery to an instrument. It’s mainly the diaphragm attached to the valve and spring system. The key control mechanism allows valve for closing and opening to prevent excessive pressure from passing via delivery instrument. 

All this and more features in oxygen regulators, you can now get from JTC Valve Sales, of which attributes include:

Lightweight body of aluminium with brass core

Accidental damage reduced due to tight cylinder grip

Ergonomic Handle

Designed for 3000 PSI use

1.5" diameter gage high visibility

Exceeds or meets CGA, FDA & ASTM standard 

Utilities

Oxygen regulators essentially regulate the oxygen reaching capacity to the body when put in use for hospital or scuba divers. As known, oxygen life saving gas, consuming high pressure of it may prove dangerous if limit exceeds 2000 PSI. For industrial purposes like cutting or welding, the oxygen regulators drop pressure to 2000 PSI from 14000 PSI to finely execute the welding job. 

Type

Oxygen regulators essentially are pressure valves which come under category of special service regulators. These are designed to regulate the oxygen gas pressure from the oxygen tank. 

Regulation

Evergreen Midwest takes into consideration the manufacturing regulators for oxygen regulators by North America Compressed Gas Association. It makes the recommendations on size of cylinders, valves and oxygen outlets for compression based upon safety considerations and experience.