简体中文
Japanese
Korean
Russian
繁体中文
EspañolValve selection
How to choose pneumatic welded ball valve and flange ball valve? In addition to connecting, it is also necessary to compare maintenance plans
The difference between welded ball valves and flanged ball valves lies not only in the presence or absence of bolts at the connection. The former welds the valve end and pipeline as the connection boundary, while the latter is connected through a flange sealing pair; The scope of work for on-site assembly, disassembly path, testing, and subsequent maintenance varies. Purchasing should compare the connection form and valve body structure together, and cannot directly understand "three piece" as being able to be disassembled and repaired online in any situation.
The connection method and the valve body separation method are two different things
The welding end and flange end describe pipeline connections, while the integral, two-piece, and three piece valve body combinations are described. As three pieces, the connection end and maintenance allowance conditions may still be different; As flange valves, they may not necessarily have the same internal disassembly method.
For welded ball valves, the specific form of butt welding or socket insertion, as well as the pipe material and size connected, should be clearly written at the end. Providing only one diameter cannot replace welding interfaces, wall thickness matching, and manufacturing document requirements.
The detachable flange does not mean that the maintenance conditions are already met
The flange connection provides a detachable interface, but the surrounding space, pipeline support, and actuator size may affect whether the valve can be removed. The project should have a clear equipment exit path and not equate dismantling bolts with completing safety isolation.
The flange scheme also includes matching sealing surfaces, gaskets, and fasteners. When comparing costs, these connecting components should be included in the same list as the inspection scope to avoid comparing prices only for bare valves.
The construction boundary of the welding plan should be agreed upon in advance
Welding heat input may affect the soft valve seat, packing, and actuator accessories. The supplier shall provide welding and protection requirements for the corresponding structure, and the construction shall be completed by qualified personnel according to approved procedures; Another series of disassembly or cooling methods cannot be directly applied.
If hot work is not allowed on site or the equipment maintenance cycle is short, welding connections may change the maintenance schedule. Conversely, when there are requirements for connection compactness and flange sealing points in the project, it is also necessary to compare the overall feasibility of the welding scheme.
The automation part cannot be missed due to connection changes
Both schemes need to be matched with valve torque, minimum air source, action mode, and accessories. The interface has been changed, which does not mean that the unverified old configuration can be used for gas loss targets, solenoid valves, and feedback requirements.
The inquiry can be divided into four columns: pipeline connection, valve body maintenance, drive accessories, construction and acceptance. Require the provision of final assembly drawings, applicable instructions, and spare parts information in order to compare the actual workload of replacing seals or valves after commissioning.
Bring this information when inquiring or comparing proposals
| project | What needs to be expressed |
|---|---|
| Pipeline connection | End form, pipe and interface size |
| Valve body structure | Separable scope and maintenance permit conditions |
| site conditions | Hot work restrictions, exit paths, and support |
| Complete set of functions | Drive, feedback, and acceptance responsibilities |
Common customer questions
Can a three piece welded ball valve be replaced with a valve seat without cutting the pipe?
You should refer to the structure and maintenance instructions of the model. Three piece does not mean that disassembly and repair are allowed under any on-site conditions; It is also necessary to meet the requirements of isolation, space, fastening, and re inspection.
Is flange ball valve always easier to maintain than welded ball valve?
It provides detachable interfaces, but the actual workload also depends on space, support, and maintenance objects. When comparing, indicate whether to replace the entire valve or deal with internal spare parts, without using an "easy to maintain" alternative to a specific solution.
Is it enough to change the manual welded ball valve to pneumatic and only add cylinders?
It is also necessary to match the valve shaft interface, bracket, load and control accessories, and confirm the entire assembly and on-site space. The lightweight feel of the original manual valve cannot replace the driving verification under differential pressure conditions.
Related products:Pneumatic welded ball valveSee similar schemespneumatic valveWhen discussing specific supply, please provide the corresponding working conditions and functional requirements in the text together.
Extended reading:How to distinguish electric threaded ball valves G, R, and NPT? Interface code and sealing method。
Technical reference:Swagelok 60 series structure and option informationReference materials are used for corresponding structures or engineering principles, and specific finished products are evaluated based on their corresponding configurations and rated conditions.
Home
Valve selection 
news information 
Contact us