Rubber Lined Butterfly Valve

Shaft Bearings                                                       

 • The shaft is carried in multiple bearings with shaft deflection due to high pressure being

    prevented, thus ensuring optimal guidance, positive location and long service life.

Vulcanised O-Rings at Shaft Passages                                                       

Standard Leakage Testing Performed                                                       

Leakage Test

 • We test each valve dry, with air in acc. to:
 • DIN 3230, T3, BO (Leakage rate 1) = gastight
 • Accepted leakage rate by DIN:

 
  up to DN 150 = 0 Bubbles  / 1 Minutes
  up to DN 500 = 0 Bubbles  / 2 Minutes
  DN 500 to DN 1000  = 1 Bubbles / 2 Minutes

 • With these results we perform also the shut off requirements of:
 • ISO 5208, Category 3,
 • API 598 Table 5
 • ANSI B 16-104, Class VI

ISO 5218 Topworks                                                       

Shaft Safety Device                                                       

 • The shaft safety device prevents inadvertant shaft removal when fitting actuators or

    undertaking maintenance procedures.

Bed Groove Elastomer Design                                                       

1. Around the centre of the whole circumference of the liner is a raised locating ring to engage with an corresponding recess in the valve body, thus assuring the exact position of the liner.

2. Positive location and retention of the liner within the body is by means of circumferential lug profiles on the liner with matching recesses in the body.

3. The collars at the shaft locations ensure accurate positioning of the liner within the valve body (sizes DN 250 and larger have an integral vulcanized in steel ring).

4. The end connection sealing faces of the liner have a convex form. During assembly of the valve into the pipeline controlled deformation of the volume of the liner achieved when clamping between flanges. This controlled deformation restricts any increase in operating torque and eliminates damage to or destruction of the elastomers.

Disc Sealing Surface                                                       

 • The sealing surface of the disc being mirror finished guarantees the benefit of low operating torque and tight valve sealing up to the maximum working pressure 16 bars. The design gives high flow characteristics.

Valve Body Machining                                                       

Video