Non-rising stem gate valve

If you are looking for a gate valve that ensures stable operation while saving installation space, then the non-rising stem gate valve (NRS gate valve) is the right choice. With its compact design and the stem located inside the valve body, this type of valve is widely used in industrial piping systems and fire protection systems, and is also highly regarded for its aesthetic value.

If you are interested, join Bao Tin Steel to explore its definition, structure, operating principle, classification, and applications. You will also learn the differences between non-rising stem and rising stem gate valves.

What is a non-rising stem gate valve?

A non-rising stem gate valve (NRS gate valve) is a type of gate valve in which the valve stem is designed to remain recessed inside the valve body, functioning to open or close the flow of the fluid.

When the handwheel is turned, the valve body does not move up or down; only the gate is raised or lowered.

General specifications of non-rising stem gate valves

Size: DN15 – DN2000
Body material: Cast iron, stainless steel, steel, brass, etc.
Gate valve stem: Non-rising stem, made of stainless steel
Connection: Threaded, flanged (BS, JIS, DIN standards)
Working pressure: PN10, PN16, PN25, etc.
Working temperature: Up to 300°C
Origin: Taiwan, Malaysia, Japan, China, Europe, etc.

Structure and Operating Principle of Non-Rising Stem Gate Valves

Structure

Each model of non-rising stem gate valve may have its own specifications depending on the brand and design, but the following common characteristics can be summarised:

Size: Available from DN15 to DN2000, suitable for installations ranging from small systems to large industrial pipelines.
Body material: Cast iron, ductile iron, stainless steel, steel, or brass.
Gate/disc: Ductile iron, stainless steel, or steel, often coated with EPDM rubber to enhance sealing performance.
Valve stem: Non-rising stem type, made from stainless steel.
Connection type: Threaded (for smaller sizes) or flanged (BS, JIS, DIN standards) for larger sizes.
Working pressure: Commonly PN10, PN16, PN25.
Working temperature: Up to approximately 300°C.
Origin: Taiwan, Malaysia, Japan, China, and Europe.
Warranty: Typically 12 months, depending on the supplier.

Operating Principle

When the handwheel is turned clockwise, the internal threaded stem pushes the gate downward, completely blocking the flow ⇒ valve closed.
When the handwheel is turned counterclockwise, the threaded stem pulls the gate upward, creating an opening for the fluid to pass through ⇒ valve open.

In the non-rising stem design, the valve stem does not move outward; it only rotates in place inside the valve body. As a result, the overall height remains unchanged during operation, helping to save installation space.

Classification of Non-Rising Stem Gate Valves

Classification by Operating Mechanism

This is the most basic and important way to classify non-rising stem gate valves.

Handwheel-operated non-rising stem gate valve

This is the most common type, featuring a handwheel mounted directly on top of the valve. The user turns the handwheel to raise or lower the gate. It is suitable for above-ground piping systems where the valve is easily accessible and operable.

You can refer to some products at BTS:

Cap-covered non-rising stem gate valve

This type does not have a handwheel; instead, it features a protective cap. When an operation is needed, a specialised key is used to turn the valve. It is commonly used in buried piping systems or confined spaces, providing a neater and safer solution.

👉 See now: ShinY concealed stem gate valve with cover.

Classification by Material

Cast iron non-rising stem gate valve

Made from grey cast iron or ductile iron. High durability, affordable, and capable of withstanding moderate pressure. Suitable for water supply and drainage systems, fire protection systems, or environments without strong corrosion.

Stainless steel non-rising stem gate valve

Made from stainless steel types 201, 304, or 316. Excellent corrosion resistance, high temperature and pressure tolerance. Ideal for chemical systems, food processing, or seawater environments.

Steel non-rising stem gate valve

Exceptional pressure and temperature resistance. Commonly used in heavy industries such as oil and gas, steam systems, or applications requiring high mechanical strength.

Applications of Non-Rising Stem Gate Valves

Non-rising stem gate valves are widely used due to their space and cost efficiency. Typical applications include:

High-pressure compressed air and steam systems
Fire protection systems (FPCS)
Corrosive chemical environments: salt, seawater, acids, bases, etc.
Clean water supply and drainage
Industrial or municipal wastewater treatment plants
Food and pharmaceutical production systems
Hydropower plants

Comparing non-returning stem gate valves and rising stem gate valves – Which one should you choose?

Many customers confuse non-rising stem and rising stem gate valves. The table below will help you easily distinguish between them:

Criteria	Non-Rising Stem Gate Valve	Rising Stem Gate Valve
Stem position	Stem is recessed inside the body.	Stem rises above the valve when open, easy to observe.
Stem structure	Smooth stem without external threads.	Stem has external threads, allowing it to move when the handwheel is turned.
Handwheel	Fixed on the stem, moves together with the stem.	Fixed on the valve body, stem rotates via threads.
State indication	Difficult to identify when buried.	Easy to observe: stem up = open, stem down = closed.
Installation size	Compact, suitable for valve pits or underground pipes.	Bulky, requires more space.
Common applications	Urban water supply, fire protection systems, and underground pipelines.	Water treatment plants, above-ground pipelines, and large projects.

Bao Tin Steel – Official Supplier of Non-Rising Stem Gate Valves

There are many suppliers of non-rising stem gate valves on the market. Bao Tin Steel confidently stands out as a highly-rated distributor, offering products from well-known brands such as ShinYi, ARV, Wonil, YDK, and more.

Thép Bảo Tín – Official Distributor of ShinYi Valves

Bao Tin Steel offers a wide range of products in various sizes, materials, and price points to suit customer needs. In addition to valves, the company also supplies steel pipes, pipe fittings, and fire protection equipment. In short, Bao Tin Steel provides a complete solution for M&E system materials.

For the fastest support, don’t hesitate to get in touch with Bao Tin Steel via our hotline at 0932 059 176.