Industry News

(1)Introduction of Gate valves

Published by jodith valve April 28,2024

See our latest gate valves send to the Russia.


Our factory Jodith is devoted to producing the best valves in Wenzhou. We are specialized in producing gate valves. There are all kinds of standard gate valve in our company such as Russian GOST standard, Chinese GB standard, American API&ASME standard and German DIN standard.

Our valves are characterized as either a rising or non-rising stem types. Rising stems provide a visual indication of valve position. Non-rising stems are used where vertical space is limited or underground.

Construction of a Gate valve

Gate valves consists of three main parts: body, bonnet, and trim. The body is generally connected to other equipment by means of flanged, screwed or welded connections. The bonnet, which containing the moving parts, is attached to the body, usually with bolts, to permit maintenance. The valve trim consists of the stem, the disc or wedge and the seat rings.

Advantages of Gate valves


  • Low fluid resistance
  • Small opening and closing moment
  • Shorter structure length
  • Good sealing performance
  • Simple shape, good casting technology and wide application range

Look bellow cast steel wedged gate valve for oil and gas industry.

(2)Products Standards Compliance

Jodith orders come from all kinks of countries, like Russia, America, German, Japan...Now, let me tell you about our product standard’s compliance.

Standards compliance:

Design and Manufacture: ANSIB16.34, API600, API6D, API603, BS1414, API602.

Face to face (end to end): ANSIB16.10, API6D,

Flanged connection: 2"~24" to ANSIB16.5, 22", 26"~36"to MSS-SP-44 to API605 on Request

Test and inspection: API598, API6D

Butt welded end: ANSIB16.5

Gate valves

Jodith Gate valve refers to the valve whose closing member (gate) moves along the vertical direction of the center line of the access. Gate valve in the pipeline can only be used for full open and shut off, not for adjustment and throttling. Gate valve is a wide range of use of a valve, the general diameter of DN50 cutting device are used, sometimes small diameter cutting device is also used gate valve.

Jodith Gate valve is used as cut-off medium, in full open the whole flow through, at this time the media operation pressure loss is the minimum. Gate valves are usually used when they do not need to be opened or closed frequently and the gate is kept fully open or fully closed. Not suitable for regulating or throttling use. For the medium with high speed flow, gate vibration can be caused when the gate is partially opened, and the vibration may damage the sealing surface of gate and valve seat, while throttle will cause gate to be eroded by medium.

Look! Today we delivered two containers of valves to our european customer.



(3)Introduction of Jodith Gate valve Disks


In order to help to make people to know more about Jodith gate valve disc, here are introduction of disks.

We Jodith valves have normally solid wedge and flexible wedge.

See bellow of our sketch of the disc:

the type of GATE VALVES

Gate valves are available with different disks or wedges. Ranging of the Gate valves is usually made by the type of wedge used.

The most common were:

  • Solid wedge is the most commonly used disk by its simplicity and strength.
  • A valve with this type of wedge can be installed in each position and it is suitable for almost all liquids. The solid wedge is a single-piece solid construction and is practically for turbulent flow.
  • Flexible wedge is a one-piece disc with a cut around the perimeter to improve the ability to correct mistakes or changes in the angle between the seats.
    The reduction will vary in size, shape and depth. A shallow, narrow cut gives little flexibility but retains strength.
    A deeper and wider cut, or cast-in recess, leaves little material in the middle, which allows more flexibility, but compromises strength.
  • Split wedge is self-adjusting and self-aligning to both seats’ sides. This wedge type consists of two-piece construction which seats between the tapered seats in the valve body. This type of wedge is suitable for the treatment of non-condensing gases and liquids at normal temperatures, particularly corrosive liquids.

If you want to know more about the gate valve disc, contact us freely by email: [email protected] or see more products from our website:

(4)Importance of Stem for the valves

Jodith factory takes the stem as the one of the most important material for our valves in order to promise the quality. Stem of a Gate valve is very important. 

In order to let you know how important the stem is, you can see the next passage.

The stem, which connects the handwheel and disk with each other, is responsible for the proper positioning of the disk. Stems are usually forged and connected to the disk by threaded or other techniques. To prevent leakage, in the area of the seal, a fine surface finish of the stem is necessary.

The stem roughness of valves matters the torque of the valves, and its machining and treatment method decides the strength enduring the usage of service.

Stems are classified as either: Rising Stem and Non Rising Stem

For a valve of the Rising Stem type, the stem will rise above the handwheel if the valve is opened. This happens, because the stem is threaded and mated with the bushing threads of a Yoke. A Yoke is an integral part from a Rising Stem valve and is mounted to the Bonnet.

For a valve of the non-Rising Stem type, there is no upward stem movement if the valve is opened. The stem is threaded into the disk. As the handwheel on the stem is rotated, the disk travels up or down the stem on the threads while the stem remains vertically stationary.


So pay attention to the stem when you order valves. It shall be seriously controlled too in production.



(5)Seats of Gate valve

There are all kinds of price high or low of gate valves in the market. There is one important factor is about the difference choose of the gate valve seat.  

Seats for Gate valves are either provided integral with the valve body or in a seat ring type of construction. Seat ring construction provides seats which are either threaded into position or are pressed into position and seal welded to the valve body. The latter form of construction is recommended for higher temperature service.

Integral seats provide a seat of the same material of construction as the valve body while the pressed-in or threaded-in seats permit variation. Rings with hard facings may be supplied for the application where they are required, which is normally faced with stellite alloy no6.


  • Low fluid resistance
  • Small opening and closing moment
  • Shorter structure length
  • Good sealing performance
  • Simple shape, good casting technology and wide application range
Technical Support: Magic Lamp