Description
Spirax Sarco BCV1 and BCV20 blowdown valves are small-bore, normally closed valves with brass bodies and corrosion-resistant internal components, primarily designed for low- and medium-pressure boiler blowdown. BCV1 and BCV20 are identical except for orifice size: BCV1 has a 3mm (1/8”) orifice, while BCV20 has a 6mm (¼”) orifice. The valves are supplied with a power connector, have an IP65 protection rating, and are suitable for (3x1mm)(18AWG) cable.
Available Sizes and Connections
-
½” threaded BSP connection, 230V model
-
½” threaded BSP connection, 110V model
-
½” threaded NPT connection, 120V model
-
½” threaded NPT connection, 120V model (UL/CSA)
Limitations
BCV1
-
Maximum boiler or steam pressure: 14 bar g (203 psi g) (cyclic operation)
-
Fluid temperature: -40-+200°C (-40- +392°F)
-
Fluid: Water and steam
-
Maximum ambient temperature: 55°C (130°F)
BCV1 (UL/CSA)
| Maximum boiler or steam pressure | 9 bar g (130 psi g) |
|---|---|
| Fluid temperature | -40-+180 ° C (-40- +356 ° F) |
| Fluid | Water and steam |
| Maximum ambient temperature | 55 ° C (130 ° F) |
BCV20
| Maximum boiler or steam pressure | 4 bar g (58 psi g) |
|---|---|
| Fluid temperature | -40-+180 ° C (-40- +356 ° F) |
| Fluid | Water and steam |
| Maximum ambient temperature | 55 ° C (130 ° F) |
Electrical Parameters
| 230 V model | 207 V - 253 V |
|---|---|
| 110 V model | 99 V - 121 V |
| 120 V model | 108 V - 132 V |
| Frequency | 50 - 60 Hz |
| Maximum power | 40 VA (starting); 16 VA/12 W (continuous) |
| Protection rating | IP65 (Nema 4) |
Materials
| Component | Material |
|---|---|
| Valve body | Brass |
| Soft seal | PTFE |
| Internal components | Stainless steel |
Weight (Approximate)
0.75 kg (1.65 Ibs)
Capacity
| Model | BCV1 | BCV20 |
|---|---|---|
| Orifice size | 3 mm ( 1 / 8 ”) | 6 mm (¼”) |
| Kv value | 0.25 | 0.8 |
[C_{V}(U K)=K_{V} × 0.963 C_{V}(U S)=K_{V} × 1.156]
For boiler blowdown applications, capacity is shown in the following table:
| Boiler pressure bar g (psi g) | Flow rate kg/h (Ib/h) | |
|---|---|---|
| BCV1 | BCV20 | |
| 1 (14.5) | 175 (385) | 560 (1232) |
| 2 (290) | 250 (550) | 790 (1738) |
| 4 (580) | 350 (770) | 1120 (2464) |
| 6 (870) | 385 (847) | - |
| 8 (1160) | 445 (979) | - |
| 10 (1450) | 495 (1089) | - |
| 14 (2030) | 590 (1298) | - |
When BCV20 is used in a BCS2 blowdown control system downstream of a steam trap, flow rates are as follows:
| Head through valve m (ft) | Cold-water flow rate kg/h (Ib/h) | Hot-water flow rate with flash steam kg/h (Ib/h) |
|---|---|---|
| 1 (3) | 253 (557) | 63 (138) |
| 2 (6) | 358 (787) | 90 (198) |
| 3 (9) | 438 (963) | 110 (242) |
| 5 (15) | 566 (1245) | 142 (312) |
| 10 (30) | 800 (1760) | 200 (440) |
Product Description
BCV1
Spirax Sarco normally closed blowdown solenoid valve, available in BCV1 and BCV1 (UL/CSA) models, with a brass body, stainless steel seat, and PTFE seal.
BCV20
Spirax Sarco BCV20 normally closed, low-pressure blowdown valve with a brass body, stainless steel seat, and PTFE seal.
Ordering Information
Example: 1 - Spirax Sarco BCV1 or BCV20 blowdown valve with BSP threaded connection, 230V 50-60Hz.
Available Spares
| Spare | Part number |
|---|---|
| Plunger and spring assembly | 4034080 |
| 230 V solenoid coil | 4034081 |
| 110/120 V coil | 4034082 |
Ordering Spares
Refer to the available spares table and specify the valve model.
Example: 1 - Plunger and spring assembly (part no. 4034080) for Spirax Sarco BCV20 blowdown valve.
