Disc check valve DN 15-100 - 932 | AWS

AWS 932 DN15–DN100 – Wafer Spring-Loaded Disc Check Valve

The AWS 932 is a wafer-type check valve designed for installation between flanges. It features a guided disc and return spring. Operation is automatic: the disc opens when flow force exceeds the closing force and closes upon reverse flow or pump shutdown. No actuator is used.

Technical Data

• Sizes: DN15–DN100 / 1/2"–4"
• Connections: DIN EN 1092-1 PN6–PN40 and ASME B16.5 Class 150–300
• Face-to-face: DIN EN 558, Series 49
• Temperature range: -196°C to +400°C, depending on body and seat material
• Pressure: up to 50 bar (stainless, superduplex, bronze); up to 40 bar (1.0619)
• Kv: 4 to 115 m³/h

Materials

Available in 1.4408 / A351 CF8M, 1.0619 / A216 WCB galvanized, 1.4469 superduplex, and C958 / CC333G aluminium bronze. Superduplex and aluminium bronze are considered for seawater, desalination, or corrosive services, subject to chloride, temperature, and velocity assessment.

Seats and Tightness

Metallic seat and soft sealing options: NBR, EPDM, FKM, PTFE. Indicative temperature limits: NBR up to +100°C, EPDM up to +150°C, FKM up to +230°C, PTFE up to +250°C. Minimum backpressure of 0.3 bar required for stated leakage class.

Applications

Suitable for clean liquids and gases without solids in industrial piping, utilities, HVAC, process water, air, seawater, and desalination, depending on material selection. Not intended for media with suspended solids.

Installation

Requires clean piping, correct centering between flanges, and straight pipe sections 5×DN upstream and downstream. Do not install directly on pump flanges. Springless version permitted only for vertical upward flow.

FAQ

When is AWS 932 selected over AWS 931?
For higher PN/Class, special materials, or extreme temperature requirements.

Is maintenance required?
Specified as maintenance-free; operational and leakage checks are determined by site operator.