Monday, October 14, 2019

Installation Basics for Ball Valves

Installation Basics for Ball Valves
The ball valve has a flange, collar and loose flange or end and end of the belt. It possesses two symmetrical body halves, a single piece ball with a ball resting on its seat and a stem. Because the ball is against the downstream seat, the standard valve is both rigid in both directions of flow. The valve can act as a hermetic shutoff valve.

Handling - Receiving and Storage
Make sure that the valve is not damaged during transport. Keep the valve as it should be prior to installation. Do not take it to the assembly site until you are ready to install it. Do not remove the shield before installing the valve in the piping. The valve is always sent opened.
Pipeline Installation
Wash or blow tube before installing valve. Crusts, sand and welding electrode parts can damage the surface of balls and sheets. There are three indications that indicate the valve's open or closed position.
a) Arrow on the centre drive
b) The groove at the end of the ball stem
c) The key of the ball stem
All are in the same direction as the flow opening. If you have questions about the arrows, check the slots and keyholes. Place the lifting strap on the valve body. Do not lift the valve with an actuator. However, the valve can be installed in a convenient location. Do not install the stem down because all leaks in the gasket can pass through the actuator. If possible, install the valve in a position where it can be removed without removing the valve from the piping if an actuator is required. Flange gaskets suitable for the operating conditions must be used. Do not use flange bolts to correct misalignment of the pipe. The actuator must not touch the tube as the vibration of the tube may damage the tube or cause it to malfunction. Do not install a valve with a flange on the necklace. The flange must be fitted with a flanged valve and sealed with a full face seal.
Valve support
Well supported pipe minimizes valve deformation due to pipe vibration. It is advisable to support piping, not valves, for maintenance purposes. However, if necessary, support the body with clamps and brackets. Do not attach the support frame to flange bolts or actuators.
Make sure the pipeline is clean
If the valve is leaked when the tubing is pressurized, the cause may be insufficient amount of test fluid, or the tube pressure of the ball is too low, so that it may not come into close contact with the sheet. In this case, loosen the actuator bracket and tap the steam or body lightly to increase differential pressure or move the ball. If you need to remove the bracket, make sure the open position has not changed.