Pay Attention to Three Points during Installation

First, pay attention to check before installation:

1. Carefully check whether the valve model and specification meet the requirements of the drawing.

2. Check whether the stem and disc are open flexibly, and whether they are stuck and skewed.

3. Check whether the valve is damaged, and whether the thread of the threaded valve is correct and intact.

4. Check whether the combination of the seat and the valve body is firm, the connection between the valve disc and the seat, the valve cover and the valve body, and the valve stem and the valve disc.

5. Check whether the valve gasket, packing and fasteners (bolts) are suitable for the requirements of the nature of the working medium.

6. The old or shelved pressure reducing valve should be removed, dust, sand and other debris must be cleaned with water.

7. Clear the port cover and check the sealing degree. The valve disc must be closed tightly.

Second, pay attention to the general provisions of installation:

1. The position of the valve installation should not hinder the operation, disassembly and maintenance of the equipment, pipes and valve body itself, while taking into account the beautiful appearance of the assembly.

2. The valve on the horizontal pipeline, the valve stem is installed upward, or the valve is installed at a certain Angle, and the hand wheel cannot be installed downward. The valve, stem and handwheel on the high-altitude pipe can be installed horizontally, and the valve is opened and closed remotely by a low vertical chain.

3. Symmetrical arrangement, neat and beautiful; The valve on the riser, under the premise of the process permits, the valve handwheel is most suitable for operation at chest height, generally 1.0-1.2m from the ground, and the valve stem must be installed along the direction of the operator.

4. The valve on the side-by-side riser, its center line elevation is best consistent, and the net distance between the handwheels is not less than 100mm; Valves on side-by-side horizontal pipes should be staggered to reduce pipe spacing.

5. When installing heavy valves on pumps, heat exchangers and other equipment, valve brackets should be set up. When the valve is frequently operated and installed more than 1.8m away from the operating surface, a fixed operating platform should be set up.

6. The valve body is marked with an arrow, and the arrow points to the direction of the flow of the medium. When installing the valve, be careful to make the arrow point the same as the medium flow in the pipeline.

7. When installing flange valves, ensure that the end faces of the two flanges are parallel and concentric, and double gaskets shall not be used.

8. When installing the threaded valve, for easy disassembly, a threaded valve should be equipped with a loose joint. The setup of the connector should consider the convenience of maintenance, usually the water flow first through the valve and then through the connector.

Third, pay attention to the following small details:

1. The valve body material of the valve body is made of cast iron, which is brittle, so it can not be hit by heavy objects.

2. When handling the valve, it is not allowed to throw; When lifting and hoisting the valve, the rope should be tied to the valve body, and it is strictly prohibited to tie to the handwheel, valve stem and flange bolt holes.

3. The valve should be installed in the most convenient place for operation, maintenance and overhaul, and it is strictly prohibited to be buried underground. The valve on the pipeline in the direct burial and trench should be equipped with a check well chamber to facilitate the opening and closing of the valve and adjustment.

4. Ensure that the thread is intact, and wrap hemp, lead oil or polytetrafluoroethylene raw material belt on the thread. When screwing, use a wrench to clamp the hexagonal valve body at one end of the pipe.

5. When installing the flange valve, pay attention to tighten the connection bolts along the diagonal direction, and the force should be uniform when screwing, to prevent the gasket from running off or causing deformation and damage to the valve body.

6. The valve should be kept closed during installation. For threaded valves close to the wall, the installation often needs to remove the stem valve disc and handwheel in order to turn. Disassembly should be carried out after twisting the hand wheel to keep the valve open.