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Threaded Forged Steel Globe Valve

Description

Threaded forged steel globe valve is a valve with closure member (disc) moving along with the center line with valve seat. It is mainly composed of valve body, disc, shaft pin and stem. The stem axis of this threaded globe valve is vertical to sealing surface of valve seat. With short opening and closing stroke and reliable cutting off performance, this forged steel valve is widely used for cutting off and regulating medium flow.

Application

Our threaded forged steel globe valve is widely applied on tap water, sewage, building, petroleum, chemical, food, medicine, textile, electricity, ship, metallurgy, energy and other pipeline systems.

Advantages of Threaded Globe Valve

1. Globe valve is much easier than gate valve in structure, manufacturing and maintenance.
2. It needs small torsion to open the forged steel valve.
3. Threaded forged steel globe valve is featured by fine sealing performance and long service time.
4. Friction is small between sealing surfaces.
5. All our products have passed CE and JB/T9092 certification.
6. 18 months warranty and lifetime technology service are offered for our products.

Features

1. Precision casting technology is adopted to manufacture valve body.
2. Two times shot blasting makes exquisite outward appearance of the threaded globe valve.
3. CNC processing is applied on valve disc.
4. When opened or closed, there is no relative sliding between valve body and disc.
5. Globe valve is lower but longer than gate valve.
6. Since medium channel twists and turns in valve body, the fluid resistance is big.
7. The medium in threaded forged steel globe valve can only flow in one direction and the flowing direction can not be changed when the forged steel valve is in operation.
8. The disc often endures erosion when fully opened.

Classifications of Threaded Globe Valve

1. According to channel direction of globe valve, it can be classified into straight through type/straight flow type/angle type/plunger type globe valve.
2. According to the location of the thread on valve stem, it can be divided into upper/lower threaded stem globe valve.
3. According to application, it can be classified into heating jacket/forged steel/oxygen dedicated/bellows/low temperature globe valve (stop valve).

Pressure: CLASS900-1500 PN16.0~26.0

1. Bolted Bonnet/Welded Bonnet Pressure Sealed Bonnet
2. Full Port
3. General or Needle Type Disc
4. Treaded Ends or SW Ends

Technical Specification of Threaded Globe Valve


Technical Specification ASME/API/BS GB/JB
Design Standard BS5352 GB/T7746
Pressure-Temperature Rating ASME B16.34 GB/T12224
Face-Face Factory Standard GB/T7746
Socket-Welded Ends ASME B16.11 GB/T1751
Threaded Ends ASME B1.20.1 GB/T306
Inspection & Test API598 JB/T9092

Material List for Main Parts of Threaded Globe Valve


No. Part Name ASTM
Carbon Steel Tailess Steel Alloy Steel
1 Body A105 LF2/LF3 A182 F304 A182 F11/F22
2 Disc A182F6a A182F6a A182 F304 A182 F6a
3 Stem A276-410 A276-410 A276-304 A276-410
4 Gasket Graphite+304
5 Sealing Ring Graphite
6 Yoke A216-WCB A216-WCB A351 CF8 A216-WCB
7 Bonnet A105 LF2/LF3 A182 F304 A182 F11/F22
8 Gland A216-WCB A216-WCB A351 CF8 A216-WCB
9 Bolt A193 B7 A320L7 A193 B8 A193 B16
10 Packing Graphite
11 Stem Bushing A276-410 A276-410 A276-304 A276-410
12 Gland A216-WCB A216-WCB A351 CF8 A216-WCB
13 Eye Blot A193 B7 A320 L7 A193 B8 A193 B7
14 Stem Nut A276-410
15 Handwheel A197 or A47-32510

Main Dimensions & Weight of Threaded Globe Valve


Pressure Size Main Dimension of Forged Steel Valve Weight(kg)
mm in. D L H W
BB/WB PB BB/WB PB BB/WB PB BB/WB PB WB PB
CLASS900 PN16.0 8 1/4 7 - 111 - 207 - 100 - 2.4 -
10 3/8 10 - 111 - 207 - 100 - 2.2 -
15 1/2 13 13 111 140 207 207 100 125 2.0 11.2
20 3/4 18 18 130 140 240 207 125 125 3.8 10.5
25 1 24 24 152 140 258 240 160 160 4.2 10.1
32 1-1/4 29 29 172 178 290 258 160 160 8.0 21.0
40 1-1/2 36.5 36.5 220 178 337 290 180 180 13.2 19.6
50 2 46.5 46.5 235 216 354 337 240 240 16.8 40.4
CLASS1500 PN26.0 8 1/4 7 - 111 - 207 - 100 - 2.4 -
10 3/8 10 - 111 - 207 - 100 - 2.2 -
15 1/2 13 13 111 140 207 207 100 125 2.0 11.2
20 3/4 18 18 130 140 240 207 125 125 3.8 10.5
25 1 24 24 152 140 258 240 160 160 4.2 10.1
32 1-1/4 29 29 172 178 290 258 160 160 8.0 21.0
40 1-1/2 36.5 36.5 220 178 337 290 180 180 13.2 19.6
50 2 46.5 46.5 235 216 354 337 240 240 16.8 40.4
Note: H means the height when valve is fully opened.

Possible Malfunction, Reason and Solution


Possible Malfunction Reason Solution
Leakage Between Disc and Valve Seat Sealing Surface 1.Dirty Stuff Attachment on Sealing Surface 2.Wear or Erosion of Sealing Surface 3.Deformation of Disc Caused by Excessive Closing Torsion 1.Cleaning Dirty Stuff 2.Regrinding Sealing Surface for Surfacing and Processing 3.Replacing the Forged Steel Valve
Leakage Between Bolted Bonnet Valve Body and Bonnet Joint 1.Uneven Fastening of Connection Studs 2.Damage on Sealing Surface 3.Wear or Invalidity of Gasket 1.Refastening Evenly 2.Repairing 3.Repalcing Gasket
Leakage at Valve Stem Packing Position 1.Malcompression of Packing Grand 2.Wear of the Packing 3.Damage of Contact Surface between the Stem and Packing 1.Tightening Compression Packing Gland Nut Evenly 2.Increasing Packing Properly 3.Grinding Stem Surface or Replacing Stem
Inflexible Falling and Rising of Valve Stem 1.Too Tight Packing Gland 2.Skewing Packing Gland 3.Clutter in Rotating Parts 4.Damage on Stem and Thread of Valve Stem Nut 5.Stem Bending 1.Appropriate Release of Packing Grand 2.Adjusting Packing Gland 3.Removing Clutters and Coating Lubricating Grease 4.Truing Thread or Replacing Stem and Valve Stem Nut 5.Adjusting or Replacing Valve Stem