Globe Valves

Globe valves
A Globe valves is a linear motion valve and are primarily designed to stop, start and regulate flow. The disk of a Globe valve can be totally removed from the flowpath or it can completely close the flowpath.

Conventional Globe valves may be used for isolation and throttling services. Although these valves exhibit slightly higher pressure drops than straight=through valves (e.g., gate, plug, ball, etc.), they may be used where the pressure drop through the valve is not a controlling factor.

Because the entire system pressure exerted on the disc is transferred to the valve stem, the practical size limit for these valves is NPS 12 (DN 300). Globe valves larger than NPS 12 (DN 300) are an exception rather than the rule. Larger valves would require that enormous forces be exerted on the stem to open or close the valve under pressure. Globe valves in sizes up to NPS 48 (DN 1200) have been manufactured and used.

Globe valves are extensively employed to control flow. The range of flow control, pressure drop, and duty must be considered in the design of the valve to avert premature failure and to assure satisfactory service. Valves subjected to high-differential pressure-throttling service require specially designed valve trim.

Generally the maximum differential pressure across the valve disc should not exceed 20 percent of the maximum upstream pressure or 200 psi (1380 kPa), whichever is less. Valves with special trim may be designed for applications exceeding these differential pressure limits.

• BS 1873
• 2" to 24"
• ASME 150 to 2500

Salient Features:

• Body and Bonnet - Cast with uniform sections, precision machined.
• In-situ hard-faced body seat - Eliminates leakage path between seat ring and body.
• Guided plug-type disc, Free-floating stem-disc connection - Uniform seating.

Body designs of Globe valves
There are three primary body designs for Globe valves, namely: Tee Pattern or Z-body, Angle Pattern and Wye Pattern or Y-body body.

TEE PATTERN GLOBE VALVE DESIGN is the most common body type, with a Z-shaped diaphragm. The horizontal setting of the seat allows the stem and disk to travel perpendicular to the horizontal line. This design has the lowest coefficient of flow and higher pressure drop. They are used in severe throttling services, such as in bypass lines around a control valve. Tee-pattern Globe valves may also be used in applications where pressure drop is not a concern and throttling is required.

Tee Pattern or Z-shaped Globe valve

ANGLE PATTERN GLOBE VALVES DESIGN is a modification of the basic Tee Pattern Globe valve. The ends of this Globe valve are at an angle of 90 degrees, and fluid flow occurs with a single 90 degrees turn. They have a slightly lower coefficient of flow than wye-pattern Globe valves. They are used in applications that have periods of pulsating flow because of their capability to handle the slugging effect of this type of flow.

Angle-body Globe valve

WYE PATTERN GLOBE VALVES DESIGN, is an alternative for the high pressure drop, inherent in Globe valves. Seat and stem are angled at approximately 45 degrees, what gives a straighter flowpath at full opening and offer the least resistance to flow. They can be cracked open for long periods without severe erosion. They are extensively used for throttling during seasonal or startup operations. They can be rod through to remove debris when used in drain lines that are normally closed.

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304 SSl - 304H & 304L - One of the most widely used and oldest of the stainless steels. This was originally called 18-8 which stood for its chromium and nickel content. It possesses an excellent combination of strength and corrosion resistance

310 SS - 310H - The strength of this alloy is a combination of good strength and corrosion resistance in temperatures up to 2100 F

316 SS - 316L - is an austenitic stainless steel has an increased molybdenum content to increase its resistance to corrosion when compared to other 300 series alloys.

317 SS - 317 is a high chromium, nickel and molybdenum version of 316 stainless designed principally for increased strength and corrosion resistance.