American standard ball valve installation and maintenance methods

installation method:

1) Remove the protective caps on both sides of the flange, and rinse and clean with the American standard ball valve fully opened.

2) Before the installation, the whole machine should be tested according to the specified signal (electricity or gas) (to prevent the use of performance due to vibration caused by transportation), and it can be installed on-line only after being qualified (wiring according to the circuit diagram of the electric actuator).

3) Before connecting to the pipeline, the remaining impurities in the clean pipeline must be flushed and removed (these materials may damage the valve seat and ball).

4) During the installation, please do not use the actuator part of the valve as lifting point to avoid damage to the actuator and accessories.

5) This type of valve - American standard ball valve should be installed in the horizontal or vertical direction of the pipeline.

6) The pipe near the installation point must not have any sag or be subjected to external forces. Pipeline supports or supports can be used to eliminate line deviation.

7) After connecting with the pipe, cross-lock the flange bolts with the specified torque.

Operation and use methods:

1) Before operation, make sure that the tubing and valve have been flushed.

2) The operation of the valve is driven by the input signal of the actuator. Rotation of the valve stem is completed: When the valve rotates forward by 1/4 turn (90°), the valve is shut off. When the valve is rotated 1/4 turn (90°) in reverse, the valve opens.

3) When the actuator direction indicator arrow is parallel to the pipeline, the valve is open; when the indicator arrow is perpendicular to the pipeline, the valve is closed.

Maintenance method:

Has a longer service life and maintenance-free period, will depend on several factors: the normal working conditions, to maintain harmony temperature / pressure ratio, and reasonable corrosion data <br> <br> Note:

● When the ball valve is closed, there is still pressurized fluid in the valve body. ● Before repair, release the line pressure and keep the valve in the open position. ● Before maintenance, disconnect the power supply or air supply. ● Before performing maintenance, disconnect the actuator from the bracket. ● Must Check that the pressure on the upper and lower pipelines of the ball valve has been removed before decomposing and disassembling. ● When disassembling and reassembling, care must be taken to prevent damage to the sealing surface of parts, especially non-metallic parts. Special tools should be used when removing O-rings. ● Assembly The bolts on the flange must be tightened symmetrically, step-by-step, evenly. ● The cleaning agent should be compatible with the rubber parts, plastic parts, metal parts and working media (such as gas) in the ball valve. When the working medium is gas, metal parts can be cleaned with gasoline (GB484-89). Non-metallic parts are cleaned with pure water or alcohol. • The individual parts that have been decomposed can be cleaned by dipping. Metal parts that still have undecomposed non-metallic parts can be cleaned with a clean, finely-cleaned silk cloth impregnated with detergent (to prevent the fibers from sticking to the parts). When cleaning, remove any grease, dirt, glue, dust, etc. that adhere to the wall surface. ● Remove non-metallic parts from the cleaning agent immediately after cleaning. Do not soak for a long time. ● After cleaning, wait until the wall cleaning agent is volatilized. (It can be wiped with a silk cloth that is not immersed in cleaning agent), but it must not be left for a long time. Otherwise, it will rust and be contaminated by dust. ● The new parts must be cleaned before assembly. ● Lubricate with grease. Grease should be compatible with ball valve metal materials, rubber parts, plastic parts and working media. When the working medium is gas, for example, special grease 221 can be used. Apply a thin layer of grease to the surface of the seal mounting groove. Apply a thin layer of grease to the rubber seal. Apply a thin layer of grease to the sealing surface and friction surface of the stem. ● Do not allow metal during assembly. Debris, fibers, grease (except for the specified use) Dust and other impurities, foreign matter, etc. Contamination, adhesion or stay on the surface of the parts or into the cavity 1), the packing can be re-locking if the filling at the filling place occurs, The stem nut must be locked again.

Note: Do not lock too tight. Normally, lock 1/4 to 1 turn again. Leakage will stop.

2) Replace the valve seat and seal A) Dismantle to make the valve in a half-open position. Rinse and remove dangerous substances that may exist inside and outside the valve body.

Close the ball valve, remove the connecting bolts and nuts on both flanges, and then completely remove the valve from the line.

Remove the drive unit in order - actuator, connecting bracket, lock washer, stem nut, butterfly shrapnel, Glam, wear plate, stem packing.

Remove the body cap attachment bolts and nuts, separate the bonnet from the valve body, and remove the bonnet gasket.

Make sure that the ball is in the "off" position, which can be easily removed from the valve body and then remove the valve seat.

Push the valve stem downwards through the hole in the valve body until it is completely removed. Then remove the O-ring and the under-stem filling.

Note: Be careful to avoid scratching the stem surface and the body packing gland seal.

B) Reassembly Cleaning and Inspection To remove the parts, it is highly recommended to replace the seats and gaskets of the valve cap gaskets with spare parts packages.

Assemble in reverse order of disassembly.

With the specified torque, cross-lock the flange connection bolts.

Use the specified torque to lock the stem nut.

After installing the actuator, input the corresponding signal to rotate the valve core by rotating the valve stem to make the valve open and closed.

If possible, perform pressure seal testing and performance testing of the valve in accordance with the relevant standards before returning the piping.

1. Principle The opening and closing part of the ball valve is a ball. The ball rotates around the center line of the valve body to achieve a valve that opens and closes.

2. Applicable places Low-pressure, small-diameter pipelines are used to cut off water flow and change the distribution of water flow or places that need to be opened and closed quickly.