RT Valves - Swing Check Valves

CONSTRUCTION DETAILS

Body
The body geometry is designed as the result of stress calculations to achieve the most regular distribution of the internal forces dues to pressure action.
The body material is high quality cast steel. The seat surface is covered by a wear resistance stainless steel. On request the seat surface can be covered also with stellite or other special material overlays.

Cover
The cover is bolted type or pressure seal type (for higher pressures). The cover is produced with forged material similar to the body material. Besides, the cover is designed and manufactured in order to ensure a perfect seal, as well as to allow an easy disassembly and reassembly work.

Disk
The disk is produced with forged material similar to the body material. A welding overlay of stainless steel material, with high hardness, is deposited on the contact surface. On request the disk can be provided with an overlay of stellite or other materials. The disk - hinge joint is built to achieve a perfect tightness mean a self-positioning system.

Pin
The pin is produced only whit special turning machinery for a high resistance and durability. The pin is produced with a high finish degree. and a strict diametrical clearance to reduce the wear at the minimum possible.

Gasket
The standard gasket is in pure graphite stainless steel reinforced. This type of gasket is suitable for many different applications. On request RT can supply special gaskets designed for the specific application or according to customer specifications.

Lever and weight
On request the swing check valve can be provided by lever with counterweight to balance the weight of the disk and make the closing more soft.

Hydraulic brake
Where the flow reversal is very quick the swing check valve shall be provided with a hydraulic brake connected to the lever. The brake, lengthening the time of closing to the selected value, avoids the damages to the valve and to the pipeline due to water hammer.