Irrigation Product Listings & Reviews
Weathermatic 21000CR Series Valve
Weathermatic 21000 Series Valve
Description:
This is Weathermatic's valve for commercial and high-end residential use.
Features:
- 5 year warranty
- 150 PSI rating
- Flexing, dual ported diaphragm to eliminate need for filter and screens (the flexible ports stretch to allow sand particles to squeeze through them)
- Reverse flow design (reverse flow reduces stretching of the diaphragm, which makes it hold up better)
- Normally closed
- Works at very low flows, good for drip systems
- Contamination resistant
- Non-corrosive exhaust orifice
- M24E high efficiency solenoid made by Weathermatic (many valve companies don't make their own solenoids)
- High strength glass-filled body and cover with stainless steel cover bolts and mating brass body inserts
- Shock cone (reduces water hammer)
- Brass, non-rising flow control
- Easy to use manual bleed lever, internal bleed (Used to manually open the valve without electricity. Internal bleed means it doesn't spit out water when used.)
Options:
- XPR pressure regulator - do not use for flows under 10 gpm. This option makes the valve regulate the downstream pressure to a desired maximum level. So regardless of how much pressure you have coming into the valve, or how much it varies, the vale will keep the pressure on the outlet side uniform. The valve can't create pressure, of course, so if you have low pressure it will not make it higher.
- Non-potable alert solenoid and warning label.
- Chloramine resistant Albino Rhino Diaphragm.
Review:
This is a fairly typical valve designed for general commercial use. Like other Weathermatic valves it has reverse flow porting and a shock cone to reduce (but not eliminate) potential for water hammer. This is a good quality valve, with a glass-filled body that is rated to 150 PSI. The valve has a 5-year warranty. This is a valve I am very comfortable with using on my best client's projects.
The XPR pressure regulator option is used if you have high water pressure and need to reduce it to make the sprinklers or drip system work correctly. This module needs a minimum flow of 10 GPM through the valve. It should also be set so the outlet pressure is at least 10 PSI lower than the water pressure at the valve inlet. I suggest that 15 PSI is a more suitable minimum pressure drop. If the pressure drop is not high enough the valve will not keep the pressure uniform, and you will have large swings in pressure which defeats the purpose of the pressure regulating valve. Therefore if you are using the XPR option I suggest you use a pressure loss of 15 PSI or more for the valve.
This valve is labeled as contamination resistant. It is important to understand what this means. This does NOT mean that the valve can handle really nasty water. What they mean is that it will be able to deal with the small amount of sand that typically comes form well water. If the water looks dirty you should install a separate filter system before the valves.
Manufacturer's Performance Data:
| Flow in GPM | 0-4 | 6 | 8 | 10 | 15 | 20 | 25 | 30 | 35 | 40 | 45 | 50 | 55 | 60 | 70 | 80 | 90 | 100 | 110 | 120 | 130 |
| PSI Loss for 1" valve | 1.2 | 1.4 | 1.6 | 1.7 | 2.0 | 3.3 | 3.0 | 4.3 | 6.0 | 7.7 | 9.5 | 11.5 | |||||||||
| PSI Loss for 1 1/2" valve | 1.3 | 1.6 | 1.9 | 2.4 | 3.0 | 3.8 | 4.6 | 5.6 | 6.7 | 9.5 | 13.0 | ||||||||||
| PSI Loss for 2" valve | 2.3 | 2.4 | 2.6 | 2.7 | 2.9 | 3.3 | 3.4 | 4.2 | 5.2 | 6.7 | 7.7 | 8.8 |