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  • Name: Tap water Antifreeze bolt ST20*1200-2
  • No.: 005
  • Time: 2012-08-13
  • Views : 237

Functions and Characteristics

1.1. The antifreezing hydrant is manufactured with foreign advanced techniques and monitored by high-precision testing equipment in a high-precision digital control centre, with its main components imported from foreign countries to ensure its high quality.

2.2. The antifreezing hydrant boasts of its excellent design, high-quality bronze, copper and stainless steel, and long durability with a service life of 10 years.

3.3. No professional service is needed for its installation. With its explicit sign of “Inlet and Outlet”, it is easy to use, achieving the aim of “water flowing for the on-valve and pipe antifreezing for the off-valve.”

4.4. In deep-freezing weather, the antifreezing hydrant could empty the water in the pipe above the ground to avoid the incurrence of pipe burst in cold regions.

5.5. After its installation, vertical antifreezing hydrant does not use any insulating layer or thermal insulator, which demonstrates itself a good appearance and saves the insulating cost, ensuring water consumption and pipe antifreezing simultaneously.

Product Outline 


以DN20*1200Technical Parameters of DN20*1200Antifreezing Hydrant:




Inlet Water Thread

Outlet Water Thread

Outlet Water Thread

Water Flow under Dynamic Pressure of 1.0MPa (L/min)

Nominal Pressure (MPa)













Customers can choose the types of antifreezing hydrant with the reference of the above table. If they need more information on the technical parameters and installation of the products above, please do not hesitate to contact with Sanhuali Company. We will help you choose the most appropriate high-quality product in terms of the depth of the permafrost belt and the actual condition.

Application Range

This product could be used in residential building, schools, kindergarten, nursing homes, hospitals, fire hydrant system, public squares, private villas, enterprises, seaports, villages, livestock farms and vegetable greenhouses where the water pipe may freeze in winter. Furthermore, it could also be used in the cooling system with recycling water of the mechanical equipment to avoid pipe freezing or bursting.


Spin the handle of the antifreezing hydrant to its end in line with the “water-supply arrow”, then you can use the tap water directly. Spin the handle of the bolt to its end in line with the “water-drain arrow” or “antifreezing arrow”, turn on the tap for pipe antifreezing. In warm seasons, turn the handle of the antifreezing hydrant to “water-supply arrow”, the water faucet works normally. Notice that, in both cases, handles should be span to their ends rather than in the middle.

Installation Instructions

1.There are two types of installation, namely, inspection shaft installation (Type A) and plow-in installation (Type B).

2.The dust on the pipe and the valve should be removed before the installation.

3.The inlet water valve of the vertical antifreezing hydrant should be installed in line with the arrow direction into the main water pipe under the permafrost belt according to the depth of the permafrost. 20cm should be left below the drain-water (outlet) valve for water seepage, which could be filled with cobblestones or similar items.

4. Customers can adjust the height of h1 according to their actual height.

5.It is advised that a general valve should be installed before the antifreezing hydrant for the convenience of future maintenance.

Inspection Shaft Installation and Plow-in Installation Diagram 


Installation Precautions

1)Before its installation, the antifreezing hydrant should be placed in cool and open area, avoiding direct exposure under the sun and staying away from the ozone area.

2)Make sure the arrow direction on antifreezing hydrant is in line with the inlet water during the installation.

3)Do not install the antifreezing hydrant into the non-water pipeline.

4)Please test the water flowing, sealing or draining before the installation by following the users’ instruction. Namely, in normal condition, the water flushes when you turn on the tap, and you can sense adsorption when you put your hand near the mouth of the tap for drainage.

5)Do not dismantle and assemble the antifreezing hydrant without authoritative permission, or it may incur water leaking and the accident.