ANSI 300 FLANGED CAST STEEL GLOBE VALVE FLANGED STAINLESS STEEL GLOBE VALVE

Globe valves

• Rising Stem
• OS&Y, Flexible Wedge
• Body: ASTM A351 Gr. CF8M
• Disc: ASTM A351 Gr. CF8M
• Stem: SS316
• Packing: PTFE
• Face to Face: ANSI B16.10
• Flange Dimensions: ANSI B16.5 150
• Test Standard: API 598
• NACE MR-0175 Full Compliance

 

Size: DN15-300mm
Pressure: Pressure: PN 10/16/25, ANSI150/300lb
Actuator: Manual
Type: Bolted Bonnet, OS&Y, straight/Y type/right angle
Standard: DIN, BS, API
Face to Face Dimension: DIN3202 or ANSI B16.10,
Flanged Dimension: DIN2501, ANSI B16.5
Industrial applications: Petroleum, Chemical, Paper Making, Fertilizer, Coal Mining, water treatment and etc.
 

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. 

Body designs of Globe valves

There are three primary body designs for Globe valves, namely..
 
Tee Pattern or Z-body
 

 
Angle Pattern
 

Wye Pattern or Y-body body
 

 

Disk and Seat and Stem of Globe valves

Disk.. The most common disk designs for Globe valves are.. ball disk, composition disk and the plug disk. Ball disk design is used primarily in low pressure and low temperature systems. It is capable of throttling flow, but in principle it is applied to stop and start flow.
Composition disk design uses a hard, non-metallic insert ring on the disk, which ensures a tighter closure.
Plug disk design provides better throttling than ball or composition designs. They are available in many different designs and they are all long and tapered.
 
Seat.. Globe valve seats are either integrated or screwed in to the valve body. Many Globe valves have backseats inside the Bonnet. Back seats provides a seal between the stem and Bonnet and prevents system pressure from building against the valve pakking, when the valve is fully open. Back seats are often applied in Globe valves.
 
Stem.. Globe valves uses two methods for connecting the disk and the stem.. the T-slot and the disk nut construction. In the T-slot design, the disk slides over the stem, while in the disk nut design, the disk is screwed into the stem.