Sempell Model VSE / VSR Safety Valves

The Sempell Model VSE and VSR Safety Valves, engineered by Emerson, are precision-designed for high-pressure and high-temperature applications requiring maximum safety, reliability, and performance. These spring-loaded safety relief valves are specifically developed to protect pressurized systems in power generation, chemical processing, oil and gas, and industrial steam systems from overpressure conditions. The VSE (flanged design) and VSR (welded or nozzle design) models combine advanced engineering with robust materials to deliver exceptional tightness, durability, and rapid response under severe service conditions. Both valve types ensure accurate opening at set pressure and tight reseating to prevent unnecessary media loss or system downtime. Sempell’s proven disc and nozzle technology, combined with optimized flow geometry, ensures stable operation even at high pressure ratios. The valves are available in a wide range of sizes, materials, and configurations to meet the most stringent industry standards and plant requirements.

Technical Specification of Sempell Model VSE / VSR Safety Valves

Size:

DN 25 – DN 200
NPS 1” – NPS 8”

Pressure Rating:

PN 10 – PN 500
class 150 – class 2500

Temperature:

-196 °C to +600 °C
–300 °F to +1100 °F

Set Pressure:

0.5 –500 bar

Design:

VSE1 open bonnet
VSE2 conventional
VSE4 weight loaded for small pressures
VSE5 balanced bellows
VSR?with adjustable blowdown

Body Material:

1.0619/SA216 WCB
1.7357/SA217 WC6
1.4308/SA351 CF8
1.4581/SA351 CF8MC
1.6220/SA352 LCC
Other materials available on request

Accessories:

Cooling spaces, balance piston, lifting lever, test gag, position indicator, soft seat

Feature of Sempell Model VSE / VSR Safety Valves

• Fully flexible connections: DIN and ASME flanges, threaded, welding ends
• Pop action
• Mechanical lift stop ensures functional stability
• High allowable back pressure
• Available with actuator for use as pneumatic operated safety valve
• One–piece spindle design