What is a non-rising stem gate valve? Compare non-rising stem gate valves and rising stem gate valves

A non-rising stem gate valve is a type of gate valve that supports opening and closing when liquid flows through. This is currently the most commonly used valve line in Vietnam. So do you know what a non-rising stem gate valve is? And is there any difference between non-rising stem gate valves and rising stem gate valves? See the useful information in this article now.

What is a non-rising stem gate valve? Its characteristics

non-rising stem gate When turning the steering wheel, the valve stem will not move up and down, but the stem will move circularly. At this time, thanks to the threaded joint of the valve disc and stem, the valve disc will lift up or down (open or close).

Features of non-rising stem gate valve:

• Pressure (mpa): 1.0
• Joint test pressure: 1.8 mpa
• Valve body test pressure: 2.1 mpa
• Temperature: ≤ 120 °C
• Use for: Water, steam

This type of valve has a special design that helps maintain flow stability. When fully open or closed, thanks to the flange, the valve has little pressure drop when flow passes through.

A non-rising stem gate valve is made from many different materials, such as stainless steel, steel, copper, etc., and depending on the application or system, we need to choose the appropriate valve. This helps the system operate effectively, with few leaks or corrosion problems.

General specifications of non-rising stem gate valve

• Size: DN15–DDN2000
• Body material: cast iron, stainless steel, steel, copper,…
• Gate valve disc: cast iron, stainless steel, steel with EPDM rubber
• Gate valve stem: submerged stem, stainless steel, stainless steel
• Connection: thread connection, flange mounting according to BS, JIS, and DIN standards
• Working pressure: PN10, PN16, PN25
• Working temperature: 300 degrees Celsius
• Origin: Taiwan, Malaysia, Japan, China, Europe, etc.
• Warranty: 12 months

Structure and working principle of non-rising stem gate valve

Non-rising stem gate valve structure

• Valve body: usually made from alloys such as cast iron, stainless steel, steel, etc. with a flange, threaded, or welded connection.
• Stem shaft: Along with the valve body, the stem shaft is also made from steel, stainless steel, or stainless steel. This shaft is fixed to the valve and only moves circularly.
• Valve disc (valve leaf): Similar to a door, it has the role of allowing or preventing fluid from passing through the valve. The valve disc is easy to open and close with the threaded connection to the stem shaft.
• Actuator: It is the part that controls the opening or closing of the valve. It uses a hand or electric controller.
• Gasket: The gasket is made from rubber and Teflon to help prevent fluids from leaking.

Working principle of non-rising stem gate valve

This valve operates quite simply; when we act on the crank or supply power to the electric unit, the valve stem shaft will rotate. It causes the valve shaft to move and enter the valve disc. The valve disc will gradually move up until it touches the valve stem; the valve will now open.

On the contrary, the valve disc will slowly lower when the steering wheel returns to its original position. When it reaches the lowest level, the valve will close.

Classification of operation of non-rising stem gate valve

non-rising stem gate valve crank handle

This is a type of gate valve that uses a steering wheel to control. This steering wheel is located on the valve. To control it, you just need to turn the steering wheel left or right. Refer to the product non-rising stem gate valve with the hand crank, Shin Yi.

Non-rising stem gate valve with electric control

This is a type of valve that uses an electric controller to control the opening and closing of the valve automatically. Thanks to its ability to open and close automatically, this valve is used in large gate valves, which are installed in toxic, harsh environments or underground systems.

Application of non-rising stem gate valve

As mentioned, non-rising stem gate valves are used in many fields today to save space and costs. Applications include:

• High-pressure compressed air and hot steam systems.
• Fire protection system
• Highly corrosive chemical environments such as salt, seawater, acids, bases, etc.
• Clean water supply and drainage systems
• Wastewater treatment plant for industrial or residential areas.
• Food and pharmaceutical production systems
• Hydroelectric system

Distinguish between non-rising stem gate valve and rising stem gate valve

Similar: These two types of valves both have the role of opening and closing the valve door to regulate fluid flow.

Different:

Many people are confused and cannot distinguish between non-rising and rising stem gate valves. Below are the basic points to help you easily identify these two types of valves:

–With non-rising stem gate valves

• The thread will be at the bottom, and the valve disc will connect to the threaded part.
• The valve shaft will be tightly connected to the steering wheel.
• Use a smooth shaft.
• Only the valve disc part moves on the valve shaft joint.
• Brass or cast iron is often used to make this valve.
• The submersible valve is compact, easy to install, and easy to maintain.
• It is difficult to observe the valve working because the valve stem is constructed on the inside of the valve body.
• Lock the valve easily with a padlock.

– With rising stem gate valve

• The threaded part is at the top, and the steering wheel will connect to the threaded part.
• The valve shaft will be permanently connected to the valve disc.
• The threaded joint on the steering wheel will help the valve and valve shaft move forward.
• Rotating the floating stem gate valve is easier thanks to the threaded shaft and gears.
• Cast steel, or forged steel, is a material commonly used to make valves.
• This valve needs more space to operate.
• Observe the valve’s operation easily by looking at whether the floating valve is in the up or down position. (If the valve is closed, the valve stem
• is not exposed; if the valve is open, the valve stem is exposed.)
• You need two lock hooks of different sizes to secure the valve securely.

Where can I buy reputable non-rising stem gate valves?

Currently, many places are selling non-rising stem gate valves. This leads to a slight difference in the price of this gate valve on the market. The price of the valve is also a factor that many customers are interested in. If you don’t know where to buy quality submersible stem gate valves, go immediately to Bao Tin Steel.

=>See more addresses to buy industrial valves in Ho Chi Minh City.

This is a company specializing in importing and supplying genuine and quality industrial supplies and equipment for the Vietnamese market. With more than 10 years of experience, the company is confident in distributing guaranteed products to customers. Along with that, customers will always receive enthusiastic and dedicated support from a team of experienced professionals here. Valve brands being traded by Bao Tin Steel include Valve Shin Yi, Valve Komax, Valve ARV, and Valve Emico, among many others with guaranteed quality and competitive prices.

Above is information about submerged stem gate valves and the difference between non-rising stem gate valves and rising stem gate valves. Bao Tin Steel hopes they will be useful to everyone. From there, it makes it easier for people to choose gate valves for their system. Contact us immediately if you need advice and want to receive a quote for submersible gate valves!

Tiger Steel is a branch of Bao Tin Steel.