Valve Spindle
Judberd is chinese manufacturer for various extension spindle, include but not limit to fix length extension spindle, telescopic extension spindle which can adjust self length to suit for different length from the valve top to the operation position,T key which can work as extension spindle and wrench meantime.
Judberd extension spindle can be used for gate valve, butterfly valve, service valve, ball valve, Underground fire hydrant etc.
Fix Length Extension Spindle
Judberd fix length extension spindle is assembled by the female type adaptor which is fitted to the valve stem, the carbon steel bar, the male type adaptor which connected to the carbon steel bar and will be operated by wrench to open or close the valve, and the PE outer protection sleeve.
1,Female type adaptor material Galvanized ductile iron 2,Cover PE 3,Cover PE 4,Body Carbon Steel 5,Cover PE 6, Male type adaptor material galvanized ductile iron
Telescopic Extension Spindle
Judberd telescopic extension spindle can change length by telescopic itself.The total length gap can be 300mm.It is suitable for unstable length situation.
You can adjust your extension spindle length according to the actual length from the valve stem nut to the opening/closing position.
2, Cover material ABS or PE 3,Connection material WCB 4,Bar material Q235
Extension Spindle DRAWING
- For DN350-DN450, the maximum torque can reach 600 N·m.For DN500-DN600, the maximum torque can reach 1000 N·m.
- The surface treatment of the valve caps at both ends of the stem shall be FBE no less than 250 microns.
- Other Length and design is available upon your requirement.OEM & ODM are welcome.
T key
The T key is a type of T-shaped switch with its built-in extension rod, allowing it to reach underground and engage with the stem cap of the valve for operation.
The T key transmits force to the valve’s stem cap through its square design.
Installation
This system typically has three parts.
a. The valve body that sits below ground and is used to turn the water on and off.
b. The spindle or extension rod, which is used to send the turning motion from up here, where it’s easy, down there, where it’s hard (because it’s below ground)
c. The valve box on top or flush with the ground, which protects that extension rod and gives you access to turn the valve on and off from up here.
1. Installation Steps for the Valve Spindle
Confirm the Extension Rod Length
Measure the distance from the finished ground level to the top of the valve stem. The length of the extension rod must match the actual burial depth.If the extension rod is too short, the valve cannot be operated.If it is too long, the valve box cover cannot be installed properly.
For adjustable extension rods, allow sufficient adjustment allowance.
Connect the Extension Rod to the Valve Stem
Align the lower end of the extension rod with the square head / keyway / coupling of the valve stem. After inserting it fully into position, secure it firmly using a fixing pin, set screw, or a dedicated coupling.
When the extension rod is rotated, the valve stem must rotate synchronously. Any obvious free play or slipping is not allowed.
Vertical Alignment of the Extension Rod
Ensure that the extension rod is perfectly vertical and aligned upward. It must not be installed at an angle.
2. Installation Steps for the Valve Box (Surface Box)
Install the Valve Box Base
Place the valve box around the extension rod. The bottom of the valve box should be set on a well-compacted sand bedding or a concrete foundation.
The valve box must not bear the weight of the valve or the extension rod; it serves only as protection and for positioning/alignment purposes.
3. Height Adjustment
Adjust the height of the valve box according to site conditions: it should be flush with the finished ground level, or 3–5 mm below the pavement to prevent damage from vehicle loads.
Typical applications include Sidewalks / landscaped areas should be flush with ground level; Roadways should use a heavy-duty load-rated surface box
4. Backfilling and Fixing
Backfill in layers, compacting each layer properly.
Around the valve box, it is recommended to use fine sand or concrete encasement (especially in roadway areas). Avoid direct contact between stones and the valve box , avoid Insufficient compaction which may cause settlement at a later stage
5. Final Inspection and Operation Test
Perform surface operation testing using a T-key or operating key. Rotate the extension rod clockwise and counterclockwise.
Confirm the valve can be fully opened, The valve can be fully closed and operation is smooth, with no abnormal resistance
6. Common Mistakes to Avoid
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The extension rod is not properly aligned, resulting in heavy operation
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The valve box bears the weight of the valve, causing later settlement
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Incorrect calculation of the extension rod length
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Backfilling is not properly compacted, leading to valve box sinking after several months
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The valve is not installed vertically, causing valve stem wear
The underground valve is responsible for “opening and closing,” the extension rod is responsible for “transmitting rotation,” and the valve box is responsible for “surface operation and protection.” All three must be coaxial, properly aligned, and structurally independent to ensure long-term reliable valve operation.
Product photos
USE
Butterfly Valve With Valve Spindle
Butterfly Valve with Gear Box with Valve Spindle
Gate Valve with Electric Actuator and Valve Spindle
Gate Valve and Surface Box and Valve Spindle
