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Bend pressure balanced Expansion Joints(Type QP B)
• Product Features
Bend pressure balanced expansion joint contains two compensating bellows at the flow end and one balanced bellows at the blind end. The compensating bellows absorb the lateral deflection imposed to the bend portion while the balanced bellows absorbs the axial movement imposed to the straight portion. when lateral deflection arises at the bend end, the spherical nuts will rotate against the spherical collars. The tie rods are designed to withstand the thrust of expansion joint due to internal pressure. This type of expansion joint is usually used in the outlet of pumps, tanks. compressors and turbines, etc. to reduce the forces imposed to the above mentioned equipment.
• Applicable Conditions
Working pressure: 0.1 through 2.5 (MPa)
Working temperature: -20 through 450 (℃)
Service life: 1000 (times)
Flange：GB、ANSI、JIS、DIN etc
• Product Specification
Nominal ID(DN): Φ200 through 1500 (mm)
• STRUCTURE
• Material
1.Bellow：Stainless steels 304 316L 321 254 309 Inconel625 31803 etc
2.Flange、weld Ends：Carbon steel Stainless steels etc
3.Tie rod Nuts：Carbon steel Stainless steels etc
• The product code consists of following elements
• Guides for expansion Joint installation
1. The expansion joint shall be installed according to the engineering drawing of pipe line and the expansion joint installations
2. In order to insure proper function of any expansion joints, it is necessary that all pipe lines in which expansion joints are located be suitably guided and anchored. The guides and anchors must be installed strictly in accordance to relevant technical documentation. Please refer to the “guideline for installation of Expansion Joints” about the principle of using guides and anchors.
3. Since the bellows used in expansion joints are made of thin stainless steel sheets, special attention shall be paid when transporting, handing and welding to avoid damage of bellows caused by dents, scores, arc strikes and weld spatters.
4. Any foreign laterals in the bellows and pipes shall be removed to ensure the proper function of expansion joints before installation.
5. If the flow direction is specified, be sure to install expansion joint with the proper orientation with the respect of flow direction arrow.
6. No movement of the expansion joint (such as axial compression or extension, lateral offset, or rotation) due to piping misalignment shall be imposed during installation so as to ensure proper function of the bellows.
• Date sheet
Date sheet （Pressure：0.6MPa） |
Product type |
Dia.
DN
（mm） |
compensating Number
Convolution
nt |
balanced
Number
Convolution
np |
overall
Length
（mm） |
Axial
Spring
rate
Kx
N／mm |
Lateral
spring
rate
Ky
N／mm |
Movemeng |
End pipe doxS
(mm) |
Axial
mm |
Lateral
mm |
6QPBSK700x8／6-J |
700 |
4+4 |
6 |
3765 |
773 |
154 |
162 |
95 |
φ720x10 |
6QPBSK800x8／6-J |
800 |
3940 |
820 |
208 |
161 |
83 |
φ820x10 |
6QPBSK900x8／6-J |
900 |
4315 |
867 |
176 |
159 |
73 |
φ920x10 |
6QPBSKl000x10／7-J |
1000 |
5+5 |
7 |
4702 |
997 |
236 |
199 |
77 |
φ1020x10 |
6QPBSKll00x10／7-J |
1100 |
5085 |
1064 |
211 |
197 |
71 |
φ1120x10 |
6QPBSKl200x10／7-J |
1200 |
5260 |
1137 |
265 |
194 |
65 |
φ1220x10 |
6QPBSKl300x10／7-J |
1300 |
5735 |
1211 |
242 |
179 |
60 |
φ1320x10 |
6QPBSKl400x10／7-J |
]400 |
5910 |
977 |
226 |
154 |
56 |
φl420x10 |
6QPBSKl500X10／7-J |
1500 |
6295 |
1035 |
209 |
154 |
52 |
φ1520x10 |
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