Precautions For Valve Installation

Dec. 11, 2019

Today Duplex Stainless Steel Ball Valve Manufacturer introduces the matters needing attention when installing the valve.

Stainless Steel Thread Globe Valve

Stainless Steel Thread Globe Valve

1, direction and location

Many valves are directional, such as Stainless Steel Thread Globe Valve, throttle valve, pressure reducing valve, check valve, etc., if installed upside down, it will affect the use effect and life (such as throttle valve), or not Function (such as pressure reducing valve), and even cause danger (such as check valve). Ordinary valves have directional signs on the valve body; if not, they should be correctly identified according to the valve's working principle. The valve cavity of the globe valve is asymmetrical left and right. The fluid must pass through the valve port from bottom to top, so the fluid resistance is small (determined by the shape), and the opening is labor-saving (due to the pressure of the medium). This is why the shut-off valve is not reversible. Other valves have their own characteristics.

The valve installation position must be easy to operate: even if the installation is temporarily difficult, the long-term work of the operator must be considered. It is best to align the valve handwheel with the chest (usually 1.2 meters away from the operating floor). In this way, it is easier to open and close the valve. The handwheel of the floor valve should be facing up and not tilted to avoid awkward operation. The valve of the wall-to-wall machine and the equipment should also allow the operator to stand. It is necessary to avoid operation in the sky, especially acid and alkali, toxic media, etc., otherwise it is very unsafe. Do not install the gate upside down (that is, the handwheel is downward), otherwise the medium will remain in the valve cover space for a long time, it is easy to corrode the valve stem, and it is contraindicated for certain process requirements. It is extremely inconvenient to change the packing at the same time.

2, construction operations

Care must be taken during the installation and construction to avoid hitting valves made of brittle materials. Before installation, check the valve, check the specifications and models, and check for damage, especially for the valve stem. You need to turn it a few times to see if it is skewed, because it is the easiest to bump the valve stem during transportation. Also remove debris from the valve.

When the valve is being lifted, do not tie the rope to the handwheel or valve stem to avoid damaging these parts. It should be tied to the flange. The pipeline to which the valve is connected must be cleaned. Compressed air can be used to remove iron oxide filings, mud, sand, welding slag and other debris. These debris, not only easily scratch the sealing surface of the valve, among which large particles (such as welding slag), can also block the small valve and make it invalid. When installing a screw valve, the sealing packing (linen plus aluminum oil or Teflon raw material tape) should be wrapped in the pipe thread, so as not to get into the valve, so as to prevent the valve from accumulating and affecting the medium flow.

When installing a flange valve such as a 10K Flange Ball Valve, pay attention to tighten the bolts symmetrically and evenly. The valve flange and the pipe flange must be parallel with a reasonable gap to prevent the valve from generating excessive pressure or even cracking. Special attention should be paid to brittle materials and low strength valves. Valves to be welded to the pipe should be spot welded, then the closing parts should be fully opened, and then welded to death.

3, protective measures

Some valves also need external protection, which is insulation and cooling. Hot steam lines are sometimes added to the insulation. What kind of valve should be insulated or kept cold depends on the production requirements.

In principle, where the temperature of the medium in the valve is too low, it will affect production efficiency or freeze the valve, it needs to be insulated or even heated; when the valve is exposed, it is unfavorable to production or causes frost, etc. Insulation materials include asbestos, slag wool, glass wool, perlite, diatomaceous earth, vermiculite, etc.; cold insulation materials include cork, perlite, foam, plastic, etc.

These are the precautions for installing the valve.

Xintai Valve Group Co., Ltd.

Hot products: Stainless Steel of Ball Valve, Gate Valve, Check valve and Globe Valve

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