Cast Check Valves

Cast Check Valve is known as one-way valve or non-return valve. The valve closes automatically driven by flow and force of medium to prevent backflow of medium. They are mainly applied on pipeline with medium flows in one direction.

Main Features :
Lixin Cast Check Valve is used to prevent back flow in the line. Flow is in a straight line through the valve resulting in minimal pressure drop. The disc swings into the open position as the media flows through the line. Back pressure in the line holds the disc in the closed position.

Design Features :

No manual intervention is involved in the whole process.

Swing Type or Lift (Piston) Type;

Bolted Bonnet and Pressure Seal;

Applied widely;

Rapid closing and flexible actions of the valve disc;

Small fluid resistance and large valve flow coefficient

Valve Brand：Lixin
Valve Structure：Check Valve
Valve Material：Carbon Steel/ Stainless Steel/Alloy steel etc.
Nominal Diameter：1/2"～60"
Valve End Connection：RF, RTJ, BW
Valve Pressure range：Class150 – 2500（PN16~PN420）
Working temperature：-101℃～+650℃
MOQ：1 SET
Certificate：BS1868, ASME B16.34, GB/T 12235, API 6D

FAQs

1. Swing type or lift (piston) type — which should I choose?
A swing type gives lower pressure drop when fully open, since the disc swings clear of the flow path — generally the default for larger lines and lower flow velocities. A lift type guides the disc (or piston) in a straight vertical path, which responds faster to flow reversal and is often preferred in higher-velocity or higher-pressure service where quick closure matters more than minimizing pressure drop. You can read our guide of the difference between lift and swing check valves.

2. When would I need a pressure seal bonnet instead of a bolted bonnet on a check valve?
Pressure seal bonnets are typically specified at the higher end of this valve's Class range (900 and above), since the seal actually tightens further under internal pressure rather than relying solely on bolt torque — bolted bonnets remain standard and sufficient through the mid-pressure classes.

3. Does reaching Class 2500 change anything besides the wall thickness of the valve?
Yes — beyond thicker walls, the bonnet design (often switching to pressure seal), flange rating, and sometimes the trim material all get reconsidered as pressure class climbs, since a Class 2500 valve is engineered as a system rather than just a heavier-built version of a Class 150 valve.

4. RF, RTJ, or BW — how do I decide on end connection?
RF suits general flanged installations; RTJ gives a more robust seal at higher pressure classes where gasket blowout risk needs to be minimized; BW (butt-weld) eliminates the flange connection entirely and is common in high-pressure, high-temperature piping where a welded joint is preferred over a bolted one.

5. Is this valve interchangeable with the Wafer Check Valve in your catalog, or are they for different applications?
They're not directly interchangeable — a cast check valve like this one is flanged or welded into the line as a standalone body, while a wafer check valve clamps between two existing flanges, taking up less space and weight. Which one fits depends on your installation space and whether you need this valve's higher Class 2500 pressure ceiling.