Sempell Model 801 ASME Swing Check Valves

The Sempell Model 801 ASME Swing Check Valve, engineered by Emerson, is a high-performance non-return valve designed to prevent reverse flow in critical steam, water, and process systems. Built in accordance with ASME standards, this valve ensures reliable flow control, tight sealing, and superior mechanical strength in high-pressure and high-temperature service conditions. The Model 801 Swing Check Valve utilizes a robust swing disc mechanism that opens smoothly with forward flow and closes automatically under backflow conditions, protecting pumps, compressors, and other downstream equipment. Its heavy-duty body construction, precision-machined seating surfaces, and optimized flow path ensure minimal pressure loss and long-term sealing integrity. Engineered for power generation, petrochemical, and industrial steam applications, the Sempell 801 delivers exceptional reliability, easy maintenance, and extended service life even in demanding environments. Its proven design and material flexibility make it a trusted choice for safety and performance in high-energy systems.

Technical Specification of Sempell Model 801 ASME Swing Check Valves

Certifications

ASME B31.1, PED

End Connection

Butt Weld

Application

High Temp, HRSG, Steam turbine

Body Design

Long Pattern

Material

Alloy, Carbon Steel, Metal, Steel

Operating Temperature

High Temperature

Pressure Class

ASME, PN

Process Connection Type

BWE

Seat/Seal Type

Metal-to-Metal, Swing

Shutoff Class

Class V (FCI 70-2)

Standards

ASME B16.34

Style

Direct-Operated

Valve Size

NPS 24 / DN 600, NPS 20 / DN 500, NPS 18 / DN 450, NPS 14 / DN 350, NPS 16 / DN 400

Valve Size Standard

DN, NPS

Valve Type

Engineered Product

Feature of Sempell Model 801 ASME Swing Check Valves

• Low maintenance gland can be retightened.
• Hardfaces sealing faces at disc and body seat.
• Low friction by burnished shaft.
• Surfaces treated bearing faces on each part with relative motion.
• Easy to disassemble bodies.
• Low resistance coefficient x by favorable flow characteristic of internal structure.
• Actuator mounting right or left possible seen from steam flow direction.
• Universal connections by various design of welding ends or direct welding-in.
• Deviating designs of welding ends in regard of dimension and material as well as other actuators, limit switches and special designs according to customers’ request can be supplied.