Flow check valve

Flow check valve accomplishes full flow opening by making disc pivot accomplishes full flow opening by having the disc pivot or tilt in the flow media. The opening stroke range in much less than that of the conventional swing check valves, therefore reduces opening and closing time critical to controlling flow reversal and reducing water hammer. The full flow area with lower head-loss ensure tilting disc check valve will operate with the highest efficiency and durability.

• The tilting disc check valve shall consist of a circular disc with conical rim, hinged about a fixed pivot above its center-line and offset from the plane of the seat, sealing against a body seat clamped between the two sections of the valve body.
• The body shall be two-piece, consisting of an entrance and a discharge section bolted together at an angle with the pipeline. An O-ring seal in a groove between the body flanges shall be in place to prevent leakage between the flanges when bolted together. The valve shall be complete with ANSI class flanges to mate with adjacent equipment.
• A body seat shall be clamped in place in a slot between the two body sections. The body seat shall have a conical finish to mate with the disc seat. There shall be an inspection port provided in both the entrance and discharge sections to provide visual access both upstream and downstream of the disc. An indicator shall be provided to show disc position for the full range of travel. Bosses shall be cast in both the entrance and discharge sections to allow for either bottom mounted dashpot or top mounted oil dashpot for controlled opening and closing.

Feature

• Non slamming closure
• Smooth and noiseless sealing
• Low head loss, low cost operation.
• Blow out proof design
• Rugged construction
• Extended hinge shaft and counterweights on both sides of the valve
• Precision machined titling disc and seat for tight shut-off in reverse flow direction
• Corrosion resistant inner parts ensure long term service under adverse conditions
• All parts, including the seat, are easily field replaceable, thus minimizing down time
• Designed with off center pivot to avoid the tendency of the disc to slam on the seat and to aid the operation at low pressure differentials

Benefit

-Variable opening and closing speeds

Short disc travel from full open to full close provides the ability to close very rapidly or very slowly to avoid contributing to slamming and surges.

-Cushioned closure

Action of the fluid on the disc is balanced due to pivot points that allow for cushioned movement of the disc into the seat.

-Long body laying length

Permits smooth passage of water with minimum turbulence and low potential for cavitation.

-Low maintenance

The stainless steel stub shafts do not come in contact with fluid and can be lubricated either manually or automatically.

-Non-slam characteristics

The design of the seat and hydraulic dashpot cushions the closing forces on the disc to allow for smooth operation. This prevents slamming of the disc into the seat.

-Low headloss

Minimal effort to keep the disc open is achieved through the balanced disc design that provides light weight lifting properties, which translates to minimal flow resistance.

-Less risk of reverse flow

Rapid closing of the disc decreases the chance of reverse flow to occur.

Specification

• Available in sizes 8 inches through 60 inches
• Various end configurations available
• Cast iron body, disc and cover
• Stainless steel disc and body seat rings
• Stainless steel hinge pin
• Other materials available upon request
• Larger size available on request

Dimension

*Dimensions are on request.