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What is the difference between a resilient seated gate valve and a knife gate valve?

08 Jul.,2024

Gate Valves and Knife Gate Valves: Isn't One Just Sharper?

As one of the resident bloggers here at Crane, I get ideas for blog posts all the time. The other day, an idea for a post about the difference between a gate valve and a knife gate valve came across my desk. &#;Seriously?&#; I said. &#;Isn&#;t the only difference that the knife gate has a sharper disk?&#;

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I should have known the difference was not so cut and dry, pardon the pun. While the gate valve and knife gate have many similarities, there are characteristics to these valves that make them inherently different.

What makes them similar?

Gate and knife gate valves are primarily for on/off service. Using these types of valves to regulate flow is not recommended because when fluid pushes against a partially closed gate vibration occurs, eventually wearing and eroding the seat and disk. For that reason, these types of valves should be either completely opened, or completely closed.

These valves are also designed to open and close slowly to protect from the effects of water hammer.

Both types of valves can be found in applications that involve:

Slurries
Heavy oils
Non-flammable viscous fluids
Wastewater
Clean water

What makes them different?

The differences between them are vast. First off, yes, the knife gate valve DOES have a sharpened disk (thank you very much). This is meant to sever any stringent solids that may keep the valve from closing and causing it to leak. But there&#;s more that makes their designs quite different.

The biggest difference between these two types of valves is that gate valves are built to ANSI standards while knife gate valves adhere to TAPPI standards. Therefore, dimensionally the gate valve is wider, flanged, and ANSI pressure rated. It also has API leak tightness standards must be met. They're bi-directional, and commonly used in steam applications as well as fluid applications. The gate valve is only available with metal seats.

Another significant difference between an ANSI gate valve and a knife gate valve is in the packing gland area. A gate valve will have a v-ring packing set that seals the shaft attached to the gate, while a knife gate valve has a packing gland that seals around the gate.

A knife gate has a very thin profile compared to its bulkier counterpart. It's also uni-directional (though bi-directional is an option on some), and comes in either wafer or lugged body, no flanges. The seats on the knife gate valve come in everything from metal to resilient types.

Two of the knife gate's biggest advantages knife are weight and expense. A 16&#; knife gate valve will typically weigh less than 300# while an ANSI gate valve will be in excess of #. The cost of the valve is similar to the weight difference as well.

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The Main Difference Between Gate Valve Metal Seat and ...

Today we are going to talk about the main differences between resilient seat gate valve and metal seat gate valve.

The sealing surface material is different.

1. Resilient Seated Valve: in the use of resilient seat valve, the two contacting sealing surfaces can be separate or all soft materials such as plastic and rubber can be used. Since the soft material is easy to deform and fills up the unevenness of the sealing surface, the soft seal can achieve a very high degree of medium sealing performance, and this extremely high degree of medium sealing performance can be repeatedly achieved. The disadvantage is that the use of soft sealing materials is affected by the pressure and temperature that the sealing materials can withstand.

2. Metal Seat Valve: metal seat valve is generally made of metal, so it is also called metal sealing surface. The metal sealing surface is susceptible to deformation due to the influence of the medium and the sandwiched particles; it is further damaged by corrosion, erosion and wear. On the contrary, if the wear particles are less uneven than the surface, the accuracy of the relatively rough surface will be improved when the sealing surface is running in.

The opening and closing part of the metal seat gate valve is a gate, and the movement direction of the gate is perpendicular to the direction of the fluid. The gate valve can only be fully opened and fully closed, and cannot be adjusted or throttled.

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Types of Metal Seat Gate Valves

According to the sealing surface configuration, it can be divided into wedge gate valve and parallel gate valve. Wedge gate valve can be divided into: single gate, double gate and elastic gate; parallel gate valve can be divided into single gate Plate type and double gate type. Divided according to the thread position of the valve stem, it can be divided into two types: open stem gate valve and dark stem gate valve.

For industrial valves, the opening and closing parts of soft-sealed gate valves are gates. The movement direction of the gates is perpendicular to the direction of the fluid. The gate valves can only be fully opened and fully closed, and cannot be adjusted or throttled.

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Principle of Resilient Seat

The resilient seat gate valve is divided into two types: bright-stem resilient seat gate valve and dark-stem resilient seat gate valve. Usually there is a trapezoidal thread on the lifting rod, through the nut in the middle of the gate and the guide groove on the valve body, the rotary motion is changed into linear motion, that is, the operating torque is turned into operating thrust. When the valve is opened, when the lift height of the gate is equal to 1:1 times the valve diameter, the fluid passage is completely unblocked, but this position cannot be monitored during operation.

Application:

1. The resilient seat gate valve is suitable for non-corrosive gas and liquid medium at room temperature (&#;80&#;). Such as clean water, air, oil, water treatment sewage and other pipelines. And has a very good sealing effect, almost zero leakage can be achieved.

2. The hard seal gate valve is suitable for high temperature (&#;425&#;) with slightly corrosive gas and liquid. Such as steam, heat transfer oil, sewage, petroleum, chemical industry, metallurgy, pipelines. Can have a certain degree of wear resistance.

3. The difference between soft seal gate valve and hard seal gate valve is that the sealing performance of soft seal is better than hard seal, but the temperature resistance and wear resistance of hard seal gate valve are better than soft seal gate valve.

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