STS is an escrow service that protects both buyers and suppliers. Funds are held securely by Made-in-China.com until order terms (e.g., delivery, quality) are fulfilled
|
Still deciding? Get samples of $ !
Order Sample
|
| Media: | Oil, Gas, Water, Seawater |
|---|---|
| Temperature: | Ordinary Temperature |
| Material: | Cast Iron |
| Shipping Cost: | Contact the supplier about freight and estimated delivery time. |
|---|
Payment Guarantee
Platform-protected payments with refund support for eligible order issues.
Platform Logistics
Inspection Service
After-Sales & Dispute Handling
Suppliers with verified business licenses
Audited Supplier Audited by an independent third-party inspection agency
Triple duty control check valve is generally used for pump control in open water supply systems and closed circulation systems.
It is often installed behind the water pump outlet or rubber expansion joint to achieve flow regulation, check, cut off, and change the installation direction.
| NO. | Name | Material | |
| Chinese Standard | ASTM Standard | ||
| 1 | Body | QT450-10 | A536 65-45-12 |
| 2 | Disc | HT250+EPDM | ASTM 126-ClassB+EPDM |
| 3 | Spring | 0CrNi18 | ASTM A276 304 |
| 4 | Upper Body | QT450-10 | A536 65-45-12 |
| 5 | Hand Weel | Carbon Steel | ASTM A570 |
| NPS | 2.5 | 3 | 4 | 5 | 6 | 8 | 10 | 12 |
| DN | 65 | 80 | 100 | 125 | 150 | 200 | 250 | 300 |
| L1 | 187 | 208 | 244 | 305 | 359 | 481 | 516 | 611 |
| L2 | 117 | 98 | 111 | 140 | 168 | 233 | 248 | 356 |
| H(Open) | 328 | 346 | 353 | 460 | 508 | 697 | 799 | 981 |
| Kv | 48.29 | 82.56 | 117.5 | 211.49 | 383.37 | 464.87 | 793.17 | 1139.48 |
| Cv | 56.4 | 96.4 | 137.1 | 246.8 | 447.4 | 542.5 | 925.6 | 1329.8 |
1.This valve should be installed at the outlet side of the pump. It can be installed vertical or horizontal.
When install it at vertical position, the medium should flow from down to up.
2. Can connect with 90° flanges or 180° flanges.
3. This valve has Non-return, regulating, close flow function.
4. All sizes have special lifting hole, can be installed conveniently.
Shanghai Flow Valve &Fitting Co, Ltd. was founded in 1998, mainly in foreign trade export business, has invested in two professional manufacturing factories in Shanghai Jiading Waigang Industrial Zoneand Tianjin Wuqing Jingbin Industrial Park.
These two subordinate factories are responsible for the professional production of ANSl, DINBS, GB and other standards of ball valve, butterfly valve, gate valve, stop valve, balance valve, filter, plug valve, control valve and other series of products.
Nearly 80% of the company's products are exported to Europe,America, the Middle East, Southeast Asia and other parts of the world and we also conduct technical cooperation and OEM production with many European and American companies.
Shanghai Flow Valve & Fitting Co., Ltd. began to actively participate in major domestic engineering projects in 2003.
lt has established five sales centers in Shanghai, Beijing, Guangzhou, Xi'an and Chongqing, and its business covers northeast China, North China, northwest China,Southwest China, Central China, South China and other regions.
The sales network and after-sales network basically cover most regions of mainland China.
A Triple Duty Valve is a precision-engineered valve designed for installation on the discharge side of a hydronic pump (heating or cooling systems). It combines three separate valve functions into one body :
Check Valve: It acts as a non-slam check valve to prevent reverse flow (backflow) and water hammer when the pump shuts off .
Balancing Valve: It allows the system to be balanced by adjusting the flow rate to the design specifications .
Shut-Off Valve: It provides positive drip-tight isolation to allow for pump maintenance .
The valve must be installed on the discharge side of the system or zone pump. The arrow on the valve body must point in the direction of the flow . To ensure accurate flow measurement and quiet operation, a minimum length of straight, unrestricted pipe is required upstream and downstream of the valve . Some manufacturers also recommend not mounting the valve directly to the pump flange to avoid noise issues .
No. To ensure proper seating of the internal disc and prevent valve slam (noise), the valve stem must be pointed up. Installation with the stem pointing downward or horizontally is not recommended .
This depends slightly on the specific model and connection type, but for standard NPT threaded Bell & Gossett models:
Maximum Working Pressure: 200 PSI (1379 kPa) .
Maximum Operating Temperature: 250°F (121°C) .
Note: Flanged or grooved connections may have different pressure ratings (e.g., 175 psig for flanged) .
To balance the system:
Open the valve fully, then energize the pump .
Connect a differential pressure readout kit (using readout probes) to the P/T ports (pressure/temperature ports) on the valve .
Read the differential pressure (ΔP) across the valve.
Refer to the manufacturer's Performance Curve or Cv rating table (usually printed on the valve nameplate or in the manual) to determine the flow rate (GPM) based on the pressure drop and the percentage the valve is open .
Adjust the valve stem position and repeat until the desired flow rate is achieved .
The memory stop is a feature that allows you to return the valve to its precise balanced position after it has been closed for maintenance. Once the correct balance point is set, you loosen the screw and slide the stop against the handle. When you reopen the valve, it stops at that exact position .
When using the valve for throttling (balancing), it is generally recommended not to exceed 25 feet of pressure drop across the valve. Exceeding this limit can cause noise (cavitation) and potential damage to the valve internals .
If the valve is leaking at the packing nut (the nut where the stem enters the bonnet), you can attempt to stop the leak by tightening the packing nut clockwise. WARNING: Use caution if the system is hot.
If tightening does not stop the leak, you may need to replace the "O" ring or packing. Some models (like the B&G 3DV) allow for packing replacement while the valve is under full system pressure, though this should only be done following the specific safety instructions in the manual .
Generally, no. Manufacturers like Bell & Gossett specifically state in their manuals that the standard 3DV Triple Duty Valve is not recommended for potable water systems . They are designed for closed-loop hydronic heating and cooling systems.
The primary advantages are space savings and lower initial installation costs. By combining three valves into one unit, it requires less piping space in mechanical rooms and reduces the labor time for installation compared to installing a separate shut-off valve, check valve, and balance valve
){kind=link}