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Is it better to install gate valve or ball valve next to regulating valve?

Because both gate valve and ball valve can be used behind the regulating valve, the functions they undertake are basically similar. The two are only different in structure, so users often have questions about whether the gate valve is better or the ball valve is better. This is exactly what this article will discuss today.

DIN-F4-BB-NRS-soft seated-wedge gate valve-DN100-PN16-copper holding ring-handwheel (3)

DIN-F4-BB-NRS-soft seated-wedge gate valve-DN100-PN16-copper holding ring-handwheel (3)

Before the problem unfolds, we must first make it clear that there is no concept of which product is better for installing a gate valve or a ball valve before and after the regulating valve. Only the more suitable one can be selected according to the actual situation of the user and the working conditions. Let’s first briefly understand the characteristics of gate valves and ball valves.
In terms of function, the gate valve can be installed before and after the regulating valve, mainly used for water supply and hot water pipelines, commonly known as water valves. Generally not used on steam pipelines, because when the steam pressure is high, the gate is difficult to open under pressure, and it is also not suitable for use on pipelines with sediment. The sediment accumulates in the ram seat groove, which will cause the gate to close. strict. The opening and closing part of the gate valve is a gate. The movement direction of the gate is perpendicular to the direction of the fluid. The gate valve can only be fully opened and fully closed, and cannot be adjusted or throttled. The ball valve can also be installed before and after the regulating valve. It is mainly used to cut off, distribute and change the flow direction of the medium in the pipeline. It has the same action of rotating 90 degrees. The difference is that the cock body is a sphere with a circular through hole. Or the channel passes through its axis.
In terms of advantages, the more prominent advantages of gate valves are small resistance, short size, and low price. The relative advantage of ball valves is that they have better fluid control characteristics than gate valves. It only

electric ball valve

electric ball valve

needs a 90-degree rotation operation and a small torque to close tightly. Ball valves are most suitable for use as on-off and shut-off valves.

From the above we can see that both gate valve and ball valve can be used before and after the regulating valve. Both of these valves are not suitable for flow control, but the ball valve has better fluid control characteristics than the gate valve, and the sealing performance is also better than that of the gate valve. . However, in actual installation cases, although gate valves and ball valves are installed before and after regulating valves, gate valves are more selected by users. This is why? details as follows:
1. It is troublesome to open and close the ball valve, and it has high requirements on the sealing surface. The sealing of the ball valve has strict requirements on the production and processing technology. If the correct manufacturer is not selected, it is easy to cause the internal leakage of the ball valve if the technology cannot meet the requirements. The cost is therefore relatively high, especially for large-caliber ball valves. The gate valve purchase cost is low, the sealing effect is good, the switch is relatively labor-saving, and when the gate valve is fully opened, it can provide the largest flow passage without causing resistance.
2. If the ball valve is in a static state for a long time, it will jam after a period of use.
3. The requirement of the ball valve for the medium is higher than that of the gate valve. For example, with more fibers and oxygen media, only ball valves can be used.
To sum up, whether it is better to install a gate valve or a ball valve before and after the control valve, we conclude that: Consider the economy, use the gate valve, and the gate valve is much cheaper. Or use gate valves on large-caliber, low-pressure oil, steam, and water pipelines. Considering the tightness, use the ball valve. The ball valve is suitable for working conditions with high requirements for leakage, and is suitable for fast opening and closing, and its quality life is better than that of gate valves.

TH Valve is a professional manufacturer of butterfly valvegate valvecheck valveglobe valveknife gate valve, ball valve with API, JIS, DIN standard, used in Oil, Gas, Marine industry, Water supply and drainage, fire fighting, shipbuilding, water treatment and other systems, with Nominal Diameter of DN50 to DN1200, NBR/EPDM/VITON, Certificates & Approvals: DNV-GL, Lloyds, DNV, BV, API, ABS, CCS. Standards: EN 593, API609, API6D

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Ball valve installation and maintenance methods

Ball valve installation:
1. It must be confirmed that the pipeline and valve have been cleaned before operation.
2. The actuator operation of the valve drives the valve stem to complete rotation according to the size of the input signal: when it rotates 1/4 turn (900) in the forward direction, the valve is closed. When the reverse rotation is 1/4 turn (900), the valve opens.

fixed ball valve

fixed ball valve

3. When the direction indicator arrow of the actuator is parallel to the pipeline, the valve opens; when the arrow is perpendicular to the pipeline, the valve closes.
Ball valve repair:
Longer service life and maintenance-free time will depend on several factors: under normal working conditions, maintaining a harmonious temperature/pressure ratio, and reasonable corrosion data. Note: When the ball valve is closed, the fluid pressure in the valve body It still exists. Before maintenance, remove the pipeline pressure and leave the valve in the open position. Before maintenance, disconnect the power supply or air supply. Before maintenance, disconnect the actuator from the bracket.

electric ball valve

electric ball valve

1. Packing lock If the packing culvert is slightly leaking, the valve stem nut must be locked. Note: Do not lock, usually lock 1/4 ring to 1 ring, the leakage will stop.
2. Replace the valve seat and seal
A. Disassembly Keep the valve in the half-open position to flush out the dangerous substances that may exist inside and outside the valve. Close the ball valve, remove the bolts and nuts of the flanges on both sides, and completely remove the valve from the pipeline. Disassemble the drive device-actuator, connecting bracket, lock washer, stem nut, butterfly shrapnel, glam, wear-resistant sheet, stem packing in order. Remove the body cover connecting bolts and nuts, separate the valve cover from the valve body, and remove the valve cover gasket. Make sure that the valve ball is in the “off” position. This will make it easier to take it out of the valve body, and then remove the valve seat. Gently push the valve stem down from the hole in the valve body until it is completely taken out, and then take out the O-ring and packing ring. Note: Please operate carefully to avoid scratching the surface of the valve stem and the packing seal of the valve.
B. Reassembly Clean and inspect the parts under investigation. It is strongly recommended to replace the valve seat and bonnet gaskets and seals with spare parts kits. Reverse the order of disassembly and assembly. Use the specified torque to tighten the flange bolts crosswise. Tighten the nut with the specified torque. After installing the actuator, rotate the valve stem to drive the valve core to rotate the corresponding input signal to make the valve open and close. If possible, after installing the pipeline, test the sealing pressure and performance of the valve according to the standard.
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TH Valve is a professional manufacturer of butterfly valvegate valvecheck valveglobe valveknife gate valve, ball valve with API, JIS, DIN standard, used in Oil, Gas, Marine industry, Water supply and drainage, fire fighting, shipbuilding, water treatment and other systems, with Nominal Diameter of DN50 to DN1200, NBR/EPDM/VITON, Certificates & Approvals: DNV-GL, Lloyds, DNV, BV, API, ABS, CCS. Standards: EN 593, API609, API6D

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Pneumatic ball valve installation instructions

Pneumatic ball valve installation instructions
Before installing the pneumatic ball valve:
1. Ensure that the installation position of the pneumatic ball valve is that the pipeline is in a coaxial position. The two flanges on the pipeline should be kept parallel. Confirm that the pipeline can bear the weight of the pneumatic ball valve.

pneumatic ball valve

pneumatic ball valve

2. Confirm whether there are impurities, welding slag, etc. in the pipeline, and the pipeline must be purged.
3. Check the nameplate of the pneumatic ball valve, and perform full-open and full-close operations several times to confirm that the valve can work normally, and then check all the details of the valve thoroughly to ensure that the valve is intact.
4. Remove the protective covers at both ends, check whether the valve body is clean, and clean the inner cavity of the valve body. Since the sealing surface of the pneumatic ball valve is spherical, even tiny debris may cause damage to the sealing surface.

Installation of pneumatic ball valve:
1. Install a gasket between the pneumatic ball valve flange and the pipeline flange according to the pipeline design requirements.
2. The bolts on the flange should be tightened symmetrically, successively and evenly.
3. When the ball valve adopts a pneumatic actuator, complete the installation of the air source according to the instructions.
4. Any section of the pneumatic ball valve can be installed at the upstream end, and the handle pneumatic pipe ball valve can be installed at any position of the pipeline. If the ball valve of the electro-pneumatic actuator is configured, it must be installed vertically, and the inlet and outlet of the valve are in a horizontal position.
Inspection after installation of pneumatic ball valve:
1. After installation, start the pneumatic ball valve to open and close several times, it should be flexible, uniform force, and the pneumatic ball valve should work normally.
2. According to the design requirements of pipeline pressure, test the sealing performance of the joint surface of the pneumatic ball valve and the pipeline flange after pressure is applied.

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TH Valve is a professional manufacturer of butterfly valvegate valvecheck valveglobe valveknife gate valve, ball valve with API, JIS, DIN standard, used in Oil, Gas, Marine industry, Water supply and drainage, fire fighting, shipbuilding, water treatment and other systems, with Nominal Diameter of DN50 to DN1200, NBR/EPDM/VITON, Certificates & Approvals: DNV-GL, Lloyds, DNV, BV, API, ABS, CCS. Standards: EN 593, API609, API6D