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Runxin F135 Tandem Water Softener Valve 1.5"
₺99,728.80
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Installation is a service · plumbing is the customer’s responsibility
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Across Türkiye
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Across Türkiye · 1–3 business days
2-Year Warranty
Misuse is not covered.
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- SKU
- WP-FV-022
- Category
- Control Valves, Water Treatment Spare Parts
Single Valve · Two Tanks · 10 m³/h
Uninterrupted Soft Water with the Runxin F135 Tandem Water Softener Valve
The Runxin F135 Tandem Water Softener Valve is a 1.5 inch volumetric (flow-controlled) valve that runs two softener tanks alternately from a single control head. While one tank supplies soft water, the other goes into regeneration or stands ready, so soft water keeps flowing to the installation even while the resin is being regenerated. It has a service flow rate of 10 m³ per hour and is used with tanks of 21–30 inch diameter.
- Connection
- 1.5" Inlet-Outlet
- Service Flow Rate
- 10 m³/h
- Tank Diameter
- 21"–30"
01Problem & Solution
The Risk of Hard Water During Regeneration
Problem
Softening Stops While a Single Tank Regenerates
In single-tank softening systems, the tank goes out of service when its resin enters regeneration. During that time either hard water reaches the installation through the bypass or the flow stops. On boiler feed and continuous production lines, even this short gap means limescale build-up or downtime. Solving the problem with a parallel system built from two separate valves, on the other hand, calls for an extra control head, cabling, settings and space.
Solution
One Valve, Two Tanks Working in Turn
The Runxin F135 Tandem Water Softener Valve brings the two tanks into service in turn: while one supplies soft water, the other regenerates or waits on standby. When the capacity of the tank in service is used up, the waiting tank takes over. Compared with installing two separate valves in parallel, it provides uninterrupted soft water with less equipment and in less space.
02Key Features
Two Tanks, One Control Point
The Runxin F135 Tandem Water Softener Valve manages a two-tank system with a simple layout in facilities that need soft water continuously.
Uninterrupted Soft Water
While one tank is in regeneration the other stays in service; soft water keeps flowing during regeneration too.
Volumetric Control
Regeneration starts according to the volume of water that has passed through the tank, not the number of days; salt and water are used according to actual consumption.
1.5 Inch Connection
The 1.5 inch inlet and outlet ports suit lines that need a service flow rate of 10 m³ per hour.
Single Control Head
There is no need to set two valves against each other; programming, monitoring and servicing are all done on a single valve.
Saves Space and Equipment
It needs less equipment than a parallel installation with two separate valves and takes up less space in the plant room.
Suited to Large Tanks
It works with softener tanks of 21–30 inch diameter and suits facility-scale systems that need a large resin volume.
03Technical Specifications
Valve Specifications
| Feature | Value | What it does |
|---|---|---|
| Brand | Runxin | The manufacturer. The valve and membrane brand decides how easily spares can be found. |
| Model | F135 Tandem | The manufacturer’s model code. Spares and service are matched by this code. |
| Valve Type | Single Valve · Two Tanks | How the valve works. |
| Application | Water Softening | Which water source and situation it is used in. |
| Inlet and Outlet | 1.5" | |
| Service Flow Rate | 10 m³/h | |
| Control Type | Volumetric (Flow-Controlled) | How the backwash timing is decided. A flow-controlled system saves both water and salt. |
| Tank Diameter | 21"–30" | |
| Power Input | DC 24V · 1.5A | |
| Bypass | Not Included | |
| Operating Mode | One in Service, One on Standby | |
| Category | Spare Part / Valve | Where the product sits in the shop. |
04Applications
Where Is It Used?
The Runxin F135 Tandem Water Softener Valve is used as the control valve of two-tank softening systems in facilities where the soft water supply must not be interrupted at any time of day.
Boiler Feed WaterSteam Generation LinesFactory Process WaterIndustrial LaundriesHotels and AccommodationHousing Estate and Building InletsHeat Exchanger Circuits24/7 Production Lines
05How It Works
How Does the Runxin F135 Tandem Water Softener Valve Work?
-
The First Tank Is in Service
Hard water passes through the resin bed of the tank in service; calcium and magnesium ions are held on the resin and soft water flows to the installation. Meanwhile the second tank stands ready.
-
The Water Volume Is Metered
The valve measures the amount of water passing through the tank in service and compares it with the capacity set according to the hardness of the water.
-
The Tanks Switch Over
When the set volume is reached, the waiting tank is brought into service; the flow of soft water is not interrupted during the switchover.
-
The Exhausted Tank Is Regenerated
The tank whose capacity is used up is regenerated with brine from the brine tank and then rinsed; the waste water goes to the drain.
-
The Alternating Cycle Continues
The regenerated tank waits on standby. Working alternately in this sequence, the tanks supply the facility with soft water continuously.
06Making the Right Choice
Which System Is the Runxin F135 Tandem Water Softener Valve Right For?
For the right choice, the flow rate, tank diameter, power supply and plumbing should be assessed together.
Flow Requirement
The facility’s consumption at its busiest hour is compared with the service flow rate of 10 m³ per hour. For systems with lower flow rates, smaller tandem valves with 1 inch connections may be sufficient.
Tank Diameter
The valve is suitable for tanks of 21–30 inch diameter. The tank diameter and resin volume are determined by measuring the water hardness and daily consumption.
Power Supply
The control head runs on DC 24V, 1.5A. This rating is the reference when replacing the adaptor; 12V adaptors are not used with this valve.
Bypass and Plumbing
The valve comes without a bypass. A bypass line with valves, the inlet-outlet pipework and the drain connection should be planned before installation.
07Maintenance and Use
Checks for Reliable Operation
For the Runxin F135 Tandem Water Softener Valve to operate reliably, the brine tank, feed water and electrical connection should be monitored together.
- Check the salt level in the brine tank regularly; if brine cannot be drawn during regeneration, the regenerated tank cannot reach its full capacity.
- If the feed water contains sand or sediment, fit a pre-filter ahead of the valve; particles strain the valve’s moving parts and the resin bed.
- Measure the hardness of the outlet water with a test kit at regular intervals; if the hardness is rising, review the capacity setting and salt consumption.
- Use the valve in a place protected from frost, direct sunlight and water splashes; plug the adaptor into a dry, accessible socket.
- Filters, membranes, resin and salt are consumables; valves, pumps and tanks are durable spare parts. For valves and spare parts, see the Control Valves category.
08Frequently Asked Questions
Common Questions
What does the Runxin F135 Tandem Water Softener Valve do?
It runs two softener tanks alternately with a single valve. While one tank is in service supplying soft water, the other goes into regeneration or waits on standby; this way soft water keeps flowing to the facility even while the resin is being regenerated.
How is it different from installing two separate valves?
In a parallel installation each tank has its own control head, cable and settings, and the way the valves work in relation to each other must also be arranged separately. With the Runxin F135 Tandem Water Softener Valve a single valve manages both tanks, so the system is installed with less equipment and takes up less space.
How much water does it deliver per hour?
The service flow rate is 10 m³ per hour, i.e. 10,000 litres per hour. The daily capacity of the system, however, is calculated from the tank diameter, the resin volume and the hardness of the feed water.
Is a bypass included?
No. The valve comes without a bypass. If water needs to be supplied to the facility during maintenance, a bypass line with valves must be installed separately; while the bypass is open, unsoftened water goes to the facility.
Which tanks is it used with?
The Runxin F135 Tandem Water Softener Valve is used with softener tanks of 21–30 inch diameter. The tank diameter and amount of resin are determined by measuring daily consumption and water hardness.
Does the Runxin F135 Tandem Water Softener Valve come with a warranty?
Units, valves, pumps and tanks carry a 2-year warranty and taps a 1-year warranty. Filters, membranes, resin and salt are consumables and fall outside the warranty. Misuse is not covered by the warranty.
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Installation
Installation is a service · plumbing is the customer’s responsibilityFitting the part falls under our service work and is subject to a service fee. Plumbing labour and any pipes, valves and fittings are not included in the price; these items are the customer’s responsibility.
Warranty
2 years · manufacturerThis product is covered by a 2-year manufacturer warranty. During the warranty period, labour and parts are free for faults arising from manufacture. Consumables such as filters, membranes and resin are outside warranty cover — they are replaced when their service life ends; they do not fail.
Withdrawal and returns
Distance sales agreementThe right of withdrawal and the return terms are set out in detail in the distance sales agreement. Systems that have been installed and commissioned, and made-to-order products, are outside its scope.
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