3501SRV-3502SRV Safety Relief Valve 3 Ply Ext. Pres. Vent Exp. Joint
Information at a Glance
Series
3500 Ext Pres Bellows Expansion Joints
Material
Steel
Size
2-240 in. / 50-6000 mm
Pressure
≤150 & 300 PSI / 10 & 20 Bar
Motion
16+ in. / 400+ mm
Canadian Registration
This product is registered throughout Canada under
CRN 0D9278.59870YTNADD3
Other Products
Product Description
Safety Relief Valve Connectors have been designed by Hyspan to meet the special requirements of safety valve escapement piping. When safety relief valves vent steam there is a sudden pressure and temperature surge in the escapement piping.
Steam velocity is typically supersonic. Hyspan connectors are designed to be installed in vertical or horizontal piping near the safety valve to isolate the valve from thermal expansion, and shock and vibration movements.
Technology & Advantages
The Hyspan design is all welded construction with a fully enclosed multi-ply bellows. The inlet pipe provides a heavy flow liner that protects the bellows from the high velocity flow and an inner ring protects the bellows from lateral contact with the inside surface of the housing. Since most escapement piping is sized larger than the relief valve outlet, Series 3500SRV connectors are designed with the outlet diameter two pipe diameters larger than the inlet to incorporate this transition.
Standard configurations are designed for 150 psig at 500º F with movements of 2” axial compression and 1” lateral offset. The cycle life for these combined movements is 1000 in accordance with the Standards of the Expansion Joint Manufacturers Association. Escapement piping must include alignment guides and main anchors.
Design Features

Series 3501SRV Safety Relief Valve Connectors Tabulation
Design Pressure: 150 psig Test Pressure 225 psig Design Temperature 500º F
Design Movements: 2.0 Compression, 1.0 Lateral, 1000 EJMA Cycles (concurrent movement)
3502SRV Product Specifications
Part Number 3502SRV | Inlet Diameter (NPS) | Outlet Diameter (NPS) | Overall Length (in) | Housing OD (in) | Effective Area (in²) | Axial Spring Rate (lb/in) | Lateral Spring Rate (lb/in) | Weight (lbs) |
---|---|---|---|---|---|---|---|---|
-131 | 2 | 4 | 26 | 8.63 | 20.7 | 140 | 86 | 100 |
-140 | 3 | 5 | 27 | 10.75 | 33.7 | 260 | 116 | 110 |
-148 | 4 | 6 | 28 | 12.75 | 44.8 | 281 | 167 | 153 |
-160 | 6 | 10 | 33 | 14.00 | 73.7 | 299 | 249 | 209 |
-167 | 8 | 12 | 36 | 16.00 | 107.3 | 331 | 346 | 274 |
-174 | 10 | 14 | 37 | 18.00 | 153.9 | 458 | 686 | 333 |
-180 | 12 | 16 | 44 | 20.00 | 201.9 | 707 | 1060 | 424 |
1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |
Ordering Information
Hyspan products are available from Sales Representatives and Distributors, or they can be purchased direct from the factory. The minimum factory order for open account customers, COD shipments, or bank card sales is $100.00 (USD). All major credit or debit cards are accepted. The minimum order for new account applicants is $100.00. Our Confidential Credit Application can be downloaded and forwarded to Hyspan for processing. All orders are subject to the following Terms and Conditions, and the following warranty applies to all material. Please read these documents.
Confidential Credit Application, can be completed on line.
