Precautions for gate valve operation

Disassembly and cleaning of the gate valve:

1. Preparation work

① According to the valve specifications required to select a good wrench, screw, hacking bar, force bar, top wire, and other tools.

② Prepare the appropriate amount of cotton yarn, detergent, valve end gasket, packing, lubricant, etc. according to the valve specifications.

2. Operation steps

① operate the valve to the fully open position.

② cut off the gate valve before and after the control valve, emptying the remaining medium in the pipe.

③ use a wrench to disassemble the flange bolts connecting the gate valve to the pipe, use a sling to attach the appropriate part of the gate valve and lift the gate valve with suitable lifting equipment.

④Disassemble the flange, check and clean the valve cavity, gate plate, stem head, flange gasket, etc.

⑤ The damaged flange gasket should be replaced, and a layer of grease should be applied to both sides of the gasket before installation.

⑥After cleaning, the stem is set into the gate, the gate guide groove and the valve body guide bar alignment, installed into the valve body, turning the hand wheel, so that the two flanges close together right, installed into the bolt, diagonal fastening nut.

⑦Commissioning is completed, according to the valve corresponding test procedures for pressure testing.

3. Technical requirements

① disassembly, collision gate, and seat sealing surface are strictly prohibited, and pay attention to the direction of the installation surface of the gate, which can be marked before disassembly.

②All parts should be thoroughly cleaned.

③Each part should be installed as far as possible according to the original state, and adjusted to a reasonable position.

 

 

Replace flange gasket:

1. Preparation

①Materials: grease, cotton yarn, leak detection fluid, sealing gasket.

②Tools: wrench, screw spinner.

2. Operation steps

①Remove the flange connection bolts, remove the valve or remove the leaking end pipe section. Clear the used gasket on the sealing surface.

②Select a suitable gasket and apply a layer of grease evenly on both sides.

③ Gasket on the sealing surface between the two flanges, align the center of the two flanges and the center of the bolt hole, install the bolt, screw on the nut, and tighten the nut diagonally with the uniform force several times. The bolt should extend the length of the nut by 2 to 3 pitches. After the flange gasket is installed, it should be qualified by doing a working pressure test without leakage.

3. Technical requirements

①The flange should be operated carefully to prevent damage to the flange.

②After completion, the tool should be cleaned and maintained.

4. Five points of gasket installation

①Choose the right flange, bolt, gasket form, material, and size should be appropriate according to the operating conditions and flange surface structure form matching.

②Check carefully: The quality of the flange, bolt, nut, and gasket should be checked carefully before installation, and there should be no burr, unevenness, crack, or other defects. Carefully check the flange, and pipe installation, there should be no off-center, wrong mouth, wrong hole, and other phenomena.

③ clean: flange sealing surface must be clean, bolts, gaskets shall not be stuck with impurities, oil, etc.

④Fitted: gasket should be concentric with the pipe or pipe fittings.

⑤ evenly: the installation of bolts and nuts should be evenly applied, and tightened symmetrically several times.

Complete solutions for Industrial valves.