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Rising vs Non rising stem
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(Materials)
(OP)
15 Mar 15 05:45HiIs there any basis for selection between rising and non rising stem for valve.Thanks...
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(Mechanical)
15 Mar 15 13:11Normally rising vs non-rising stem only applies to Gate Valves.Non Rising stem Gate Valves are normally cheaper than the Rising stem versions.Why are you asking this question?What is your potential use (purpose for this valve)?
Sometimes its possible to do all the right things and still get bad results
(Mechanical)
16 Mar 15 05:01Rising stem is normally with Outside Screw & Yoke with the stem threads being isolated from the medium by stem packing whilst in non rising the thread is exposed to the medium therefore could be subject to erosion, corrosion etc depending on the medium therefore should be of more corrosion resistant material hence more expensive. The only advantage I can think of with non rising stem is where space is limited and both non-rising and rising can apply also to globe valves as well as gate. On a recent project our contractor stipulated rising stem as per data sheets but vendor offered non rising in small bore globe valves which was accepted as stem material was suitable for the medium.
(Petroleum)
16 Mar 15 08:37Often this is no more than custom and practice, not technical. Many operators prefer rising stem as it is much easier to rapidly see from a long way away which valves are open or closed. On a big manifold or complex pipe system this can be very important.Rising stems are exposed to the elements and can become corroded, painted and require greasing on a regular basis.
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(Mechanical)
16 Mar 15 14:46Be also reminded that knife-gate valves normally have the knives rising to free air (past body/knife sealings) on a non-rising stem. Also: some fluids (gas, steam, toxic, surrounding harming) will require all parts closed in, and a nonrising stem and closed bonnet is required.In general, for harmless fluids, I agree with all above: it is mostly a practical and pricing question, if quality and lifetime els is about equal.
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mstnland
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4 min read
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Feb 18, 2023
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We all know that a gate valve needs to be installed to build a building, but the gate valve has two types of open rods and dark rods, and many users do not understand the situation. What is the difference between a rising stem gate valve and a non rising stem gate valve? Let’s take a look together.
1. Rising stem and non rising stem gate valve advantages
Rising stem valve features
Gate valves are usually designated as rising-stem and non rising stem designs, so it’s important to learn about the features and advantages of rising and non rising gate valve. The advantage of non rising stem globe valve is that they permit easy visualization as to whether a valve is open or closed. The advantage of the Non-Rising Stem, or NRS valves, is that the stem is protected from exposure to corrosive or other environmental conditions by the valve bonnet. Neither design has much impact on the actual valve function. Rising stem gate valves are usually made from cast or forged steel while non rising stem gate valves are more typically brass, bronze or cast iron. MSTNLAND China stem gate valve can has many applications. Non rising stem valves, however, take up less space and rising stem valves require more space. In the rising stem gate valve, the round handle rotates a threaded shaft which is attached to its center. Turning the handle will cause the stem to rise as it opens the valve and descend as it closes the valve. How to tell if a gate valve is open or closed? If it’s a rising stem gate valve it is easy to tell by looking at the amount of stem that is exposed. If the handle is flush with the pipe (no exposed stem), the valve is closed. If a lot of stem is exposed, the valve is open.
Non rising stem valve features
This simple system has a couple of disadvantages which can be avoided compared with another type of gate valve: the non rising stem gate valve. As for the non rising stem gate valve, it is usually suitable for tight places where there is not enough room for the stem to raise, for example, places with underground pipes. The non rising stem gate valve is fully open when the handle is rotated as far as possible to the left and fully closed when the handle is rotated as far as possible to the right. In both cases the handle is flush with the pipe because the mechanism inside the pipe opens and closes the valve without raising the stem. Another advantage to the non-rising stem gate valve is that it is easier to padlock. With the rising stem gate valve, two different size padlocks could be needed to lock the valve open and closed. With the non rising gate valve one padlock is enough. But the disadvantage of a non rising stem gate valve is the fact that the screw threads that lift the gate are exposed to the fluid being controlled by the valve. This can cause problems if the fluid tends to foul the threads, so non rising stem valves are usually only used on clean liquids and gases. Therefore, these two kinds of valves have their own advantages and can be purchased according to actual needs. A group of potential valve manufacturers producing high-quality China stem gate valve have been spawned by the huge China valve market. MstnLand is one of them. As a professional non rising stem gate valve manufacturers, MstnLand aims to provide all customers with high quality non rising stem valve.
2. The difference between rising and non rising stem gate valve
Different shapes
The stem of the open industrial gate valve is directly exposed and can be seen directly, while the stem of the dark stem gate valve is set inside the valve body and cannot be seen directly. If you want to check the valve stem, you need to first Open the valve body.
Different switching principles
The valve stem of the open stem gate valve is driven up and down through the valve stem and the steering wheel thread, while the valve stem and the steering wheel of the dark stem gate valve are relatively stationary, so when switching up and down, it can be directly rotated at a fixed point. , to realize the drive gate valve.
Different methods of lifting the gate
The stem of the rising stem gate valve is exposed, the nut is fixed on the handwheel, and the gate is lifted by rotating the screw. At this time, the screw and the gate are in relative rotational motion, and the surface of the gate valve can be seen. to the door type bracket. The nut of the dark stem gate valve is fixed on the gate, and the rotation of the screw itself is used to complete the action of lifting the gate, so from the appearance, the door clip cannot be seen.
Conclusion
The above difference between the rising stem vs non rising stem gate valve gate valve rising stem vs non rising stem is introduced here, I hope to help you. There are obvious differences between the open stem gate valve and the dark stem gate valve in terms of working principle and appearance, so when purchasing, you must fully understand it to avoid unnecessary influence.
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