How to distinguish electric threaded ball valves G, R, and NPT? Interface code and sealing method

First identify G, R, or NPT for threaded ball valves, and then verify the size and sealing method. Trying to screw it in is not a proof of match; It is best to provide identification or drawings at both ends for procurement to avoid discovering inconsistent tooth profiles after installation.

Parallel and conical, with different geometric and sealing criteria

G usually corresponds to the ISO 228 parallel pipe thread system, and the thread itself is not used as the basis for pressure sealing of this system. Sealing requires end faces, gaskets, or other structures in the design. The codes related to R belong to another pipe thread system, and specific codes need to be distinguished for internal threads; NPT adopts its corresponding conical system. When identifying, one should not only look at whether there is a taper, but also compare the complete identification with the matching file.

The nominal size is the same, but we cannot guarantee that the tooth shape and pairing will be the same

The tooth shape, pitch, and size requirements of different systems may vary, and similar shapes can easily cause mismatches. On site trial twisting cannot replace thread identification, and hard twisting may also damage the valve body connection end. When replacing old equipment, it is advisable to obtain interface markings, original documents, or dimensions confirmed by qualified measurements, rather than just writing half an inch based on the product name. The adapter also needs matching ends and sealed boundaries.

Sealing materials cannot repair mismatched tooth shapes

Wrapping materials or other sealants have corresponding media, temperature, and connection application ranges, and cannot turn incorrect threads into qualified interfaces. If end face sealing is used for parallel threads, there should be corresponding sealing surfaces and sealing components, and it cannot be replaced by adding thread packing. When verifying the interface for procurement, the matching threads, sealing parts, and applicable media should be listed together; The fastening requirements should follow the corresponding product specifications, and the same number of turns or torque should not be applied across interfaces.

Electric ball valves also have drive space and load requirements

After the interface pairing is correct, it is also necessary to confirm whether the actuator can accommodate it, whether the connecting pipe can transmit torque to the valve body and whether the pipe section is properly supported. The power supply, control mode, and feedback are independent of the pipe thread system. The Q911F-16P in the station belongs to electric threaded ball valve products, and the model alone cannot prove that this batch of finished products must use G or NPT. Procurement should list interfaces, media, working temperature and pressure, and electric configuration simultaneously to avoid having only one valve model.

Comparison of selection information

Corresponding products and selection entrance

When inquiring about purchasing threaded ball valves, providing a complete interface description for the "partial opening" can reduce the problem of connecting but unable to seal reliably. Correctly identifying threads comes before selecting sealing materials and also before integrating electric control.

Related structures can be combinedElectric threaded ball valve Q911F-16PUnderstanding of specific product information. See more similar directionsElectric Valve Product Column。

General principle data:Swagelok — Basic pipe threads explainedThe principle described does not mean that the finished product on this site adopts the manufacturer's configuration or rated value.