Spirax Sarco PF51G-2BD/PF51G-1BD Bronze Pneumatic Piston Switch Angle Valve
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Description
Spirax Sarco PF51G Bronze Pneumatic Piston On/Off Angle Valve is a 2-way pneumatic piston on/off angle valve with bronze body for water, air, oil, gas and low pressure steam systems. The pneumatic signal is loaded on the actuator piston to switch the valve, and the piston has a spring return function. The valve plug is PTFE soft seal (G) for tight closing. Standard models and models with flow regulators are equipped with a valve position indicator and are available in three actuator sizes, Type 1 (45 mm), Type 2 (63 mm) and Type 3 (90 mm), and the mode of action is categorized as NC (normally closed), NO (normally open), and BD (bi-directional flow, normally closed). Travel switches and flow regulators are also available.
Available Models
| Available types | SKU |
|---|---|
| 1/2" PF51G-1NC BSP | 3733090 |
| 1/2" PF51G-1NO BSP | 3733190 |
| 3/4" PF51G-1NC BSP | 3733091 |
| 1" PF51G-2BD BSP | 3733295 |
| 1" PF51G-2NC BSP | 3733095 |
| 1" PF51G-2NO BSP | 3733195 |
| 1 1/4" PF51G-2BD BSP | 3733296 |
| 1 1/4" PF51G-2NC BSP | 3733096 |
| 1 1/2" PF51G-2NC BSP | 3733097 |
| 2" PF51G-2NC BSP | 3733098 |
Available ranges - sizes, pipe connections and actuator types
| Valve type | pipe connection | Valve Action Method | Actuator type | Caliber (½" - 2") |
|---|---|---|---|---|
| PF51G | Thread BSP or NPT | NC - Normally closed (from above seat) | 1 | PF51G - 1NC PF51G - 2NC PF51G - 3NC |
| PF51G | Thread BSP or NPT | NO - Normally open (from below seat) | 1 | PF51G - 1NO PF51G - 2NO PF51G - 3NO |
| PF51G | Thread BSP or NPT | BD - Bidirectional flow, normally closed (flow above or below seat) | 1 | PF51G - 1BD PF51G - 2BD PF51G - 3BD |
Pressure/Temperature Limits
| BSP NPT body design conditions | ½" - 1½" | PN25 |
|---|---|---|
| BSP NPT body design conditions | 2" | PN16 |
| PMA Maximum Allowable Pressure | 25 bar g | |
| TMA Maximum Allowable Temperature | 180 °C | |
| Minimum permissible temperature | -10 | ℃ |
| PMO maximum working pressure under saturated steam | 9 bar @ 180 °C | |
| TMO Maximum Operating Temperature | 180 °C | |
| Minimum operating temperature (Note: below this operating temperature, consult Spirax Sarco) | -10 °C | |
| Ambient Temperature Limits - Maximum | 60 | ℃ |
| Ambient Temperature Limits - Minimum | -10 | ℃ |
| △PMX Maximum Differential Pressure | See page 4 | |
| Maximum cold test pressure 1.5 x PMA (PN rating) | ||
| Note: Test pressure must not exceed △PMX when internal parts are installed. |
Technical Parameters
| leak rate | PTFE soft-seal quick-open from above the seat | ASME class VI on/off 1 - 2 |
|---|---|---|
| Flow characteristics | ||
| direction of flow | PF51G - NC | 1 - 2 from above the seat |
| direction of flow | PF51G - NO | 2-1 from below the seat |
| direction of flow | PF51G - BD | 1 - 2 from above seat; 2 - 1 from below seat |
| pilot medium | Air or water up to 60 °C | |
| Actuator rotatable angle | 360 ° | |
| Actuator Model and Size - Model 1 = 45mm Diameter | Pilot valve connection | ¼" BSP |
| Actuator Model and Size - Model 1 = 45mm Diameter | Maximum pilot valve pressure | 10 bar g |
| Actuator Model and Size - Model 2 = 63mm Diameter | Pilot valve connection | ¼" BSP |
| Actuator Model and Size - Model 2 = 63mm Diameter | Maximum pilot valve pressure | 10 bar g |
| Actuator Model and Size - Model 3 = 90mm diameter | Pilot valve connection | ¼" BSP |
| Actuator Model and Size - Model 3 = 90mm diameter | Maximum pilot valve pressure | 8 bar g |
| Kvs value | ½" | 4.5 |
| Kvs value | ¾" | 8 |
| Kvs value | 1" | 15.6 |
| Kvs value | 1¼" | 24.6 |
| Kvs value | 1½" | 42 |
| Kvs value | 2" | 57 |
| Conversion formula | Cv (UK)=Kv x0.963 Cv (US)=Kv x1.156 |
material (that sth is made of)
| Serial number parts | material (that sth is made of) |
|---|---|
| 1 | Bronze EN 1982 CC491K |
| 2 (½" and 1") | Bronze EN 1982 CC491K |
| 2 (¾", 1¼", 1½" and 2") | Brass EN 12165 CW617N |
| 3 | Stainless steel AISI 316L |
| 4 | PTFE |
| 5 | Stainless steel AISI 316 |
| 6 | V-shaped PTFE |
| 7 | Fluorinated rubber |
| 8 | Polyamide glass |
| 9 | Polyamide glass |
| 10 | Fluorinated rubber |
| 11 | PTFE |
△PMX - PF51G Pneumatic Piston Angle Valve Maximum Differential Pressure
-
PF51G - NC (normally closed)
Available types Valve Caliber Actuator Diameter(mm) Direction of flow (1 - 2) Maximum differential pressure (bar) Pilot medium pressure (bar) PF51G - 1NC ½" 45 Above the valve seat 1.8 - 10 16 PF51G - 1NC ¾" 45 Above the valve seat 1.8 - 10 16 PF51G - 1NC 1" 45 Above the valve seat 1.8 - 10 16 PF51G - 2NC ½" 63 Above the valve seat 1.5 - 10 20 PF51G - 2NC ¾" 63 Above the valve seat 1.5 - 10 20 PF51G - 2NC 1" 63 Above the valve seat 1.5 - 10 20 PF51G - 2NC 1¼" 63 Above the valve seat 3.0 - 10 16 PF51G - 2NC 1½" 63 Above the valve seat 3.0 - 10 16 PF51G - 2NC 2" 63 Above the valve seat 3.0 - 10 11 PF51G - 3NC 1" 90 Above the valve seat 1.0 - 8 20 PF51G - 3NC 1¼" 90 Above the valve seat 2.5 - 8 16 PF51G - 3NC 1½" 90 Above the valve seat 2.5 - 8 16 PF51G - 3NC 2" 90 Above the valve seat 2.5 - 8 15 -
PF51G - NO (normally open)
Available types Valve Caliber Actuator Diameter(mm) Direction of flow (2 - 1) Maximum differential pressure (bar) Pilot medium pressure (bar) PF51G - 1NO ½" 45 Below the valve seat 1.8 - 10 16 PF51G - 1NO ¾" 45 Below the valve seat 1.8 - 10 16 PF51G - 1NO 1" 45 Below the valve seat 1.8 - 10 16 PF51G - 2NO ½" 63 Below the valve seat 1.5 - 10 16 PF51G - 2NO ¾" 63 Below the valve seat 1.5 - 10 16 PF51G - 2NO 1" 63 Below the valve seat 1.5 - 10 16 PF51G - 2NO 1¼" 63 Below the valve seat 1.5 - 10 16 PF51G - 2NO 1½" 63 Below the valve seat 1.5 - 10 16 PF51G - 2NO 2" 63 Below the valve seat 1.5 - 10 12 PF51G - 3NO 1" 90 Below the valve seat 1.0 - 8 16 PF51G - 3NO 1¼" 90 Below the valve seat 1.0 - 8 16 PF51G - 3NO 1½" 90 Below the valve seat 1.0 - 8 16 PF51G - 3NO 2" 90 Below the valve seat 1.0 - 8 16 -
PF51G - BD (two-way flow, normally closed)
Available types Valve Caliber Actuator Diameter(mm) Flow direction (1 - 2) Maximum differential pressure (bar) Flow direction (2 - 1) Maximum differential pressure (bar) Pilot medium pressure (bar) PF51G - 1BD ½" 45 16 5.0 - 10 16 PF51G - 1BD ¾" 45 16 5.0 - 10 7.0 PF51G - 1BD 1" 45 16 5.0 - 10 5.0 PF51G - 2BD ½" 63 16 3.8 - 10 16.0 PF51G - 2BD ¾" 63 16 3.8 - 10 16.0 PF51G - 2BD 1" 63 16 3.8 - 10 11.0 PF51G - 2BD 1¼" 63 16 3.8 - 10 6.0 PF51G - 2BD 1½" 63 12 3.8 - 10 4.0 PF51G - 2BD 2" 63 8 3.8 - 10 2.5 PF51G - 3BD 1" 90 16 3.3 - 8 14.0 PF51G - 3BD 1¼" 90 16 3.3 - 8 12.0 PF51G - 3BD 1½" 90 16 3.3 - 8 8.0 PF51G - 3BD 2" 90 14 3.3 - 8 5.0
Weight (approximate)
| Valve Caliber | Actuator type and size | Weight (kg) |
|---|---|---|
| ½" | 1 (45 mm) | 0.8 |
| ½" | 2 (63 mm) | 1.2 |
| ¾" | 1 (45 mm) | 0.9 |
| ¾" | 2 (63 mm) | 1.3 |
| 1" | 1 (45 mm) | 1.1 |
| 1" | 2 (63 mm) | 1.5 |
| 1" | 3 (90 mm) | 2.2 |
| 1¼" | 2 (63 mm) | 1.9 |
| 1¼" | 3 (90 mm) | 2.4 |
| 1½" | 2 (63 mm) | 2.4 |
| 1½" | 3 (90 mm) | 2.6 |
| 2" | 2 (63 mm) | 2.9 |
| 2" | 3 (90 mm) | 3.3 |
| Note: Add 0.2 kg for valves with travel switches and flow regulators (except actuator 1). |
Valve Selection Guide
| Valve Caliber | ½", ¾", 1", 1¼", 1½" and 2" |
|---|---|
| Valve type | P = Piston |
| Valve Flow Characteristics | F = fast open |
| Valve body material | 5 = Bronze |
| connection method | 1 = Threaded BSP or NPT |
| Stem seals | G = PTFE |
| Actuator type | 1 = 45 mm diameter (valve bore ½" - 1") 2 = 63 mm diameter (valve bore ½" - 2") 3 = 90 mm diameter (valve sizes 1" - 2") |
| valve position | NC = Normally closed NO = Normally open BD = Bidirectional flow, normally closed |
| options (as in computer software settings) | I = travel switch (solenoid relay indicating the switching position of the valve, maximum ratings: voltage (V) = 500 V, current (I) = 0.5 A, power § = 30 VA, suffix 'I' after actuators 2 and 3 as required) R = flow regulator (allows manual control of the maximum flow rate of the valve, for normally open valves, manual shut-off is available, add suffix ' R ' to actuators 2 and 3 as required) |
Ordering Example
1 - Spirax Sarco PF51G - 2NC Bronze Pneumatic Piston Switching Angle Valve, Threaded BSP, 1"
How to order
A set of sealing components is available for valves and actuators of different diameters, including: piston lip seals, actuator O-rings, valve plug soft seals (PTFE), and valve body seals.
Example of ordering spare parts
1 - Seal kit for PF51G - 2NC, date code 120, 1"
Security information, installation and maintenance
For detailed information, please refer to the installation and maintenance guide supplied with the product. The valve can be mounted in any orientation and the actuator can be rotated 360° for ease of solenoid installation.
Related Components - Solenoid Valves
DM 2-position 3-way solenoid valves can be directly mounted (banjo type connection) on pneumatically operated switching angle valves of the PF51G - NC, NO and BD series, with operating medium air or water, with DIN connection of the valve.
| Available types | typology | actuators | Voltage/Frequency | connection method |
|---|---|---|---|---|
| DM11 | 1 | 45 mm | 230/50 or 240/60 Vac. | 1 / 8 " BSP |
| DM12 | 1 | 45 mm | 110/50 or 120/60 Vac | 1 / 8 " BSP |
| DM13 | 1 | 45 mm | 24/50 or 24/60 Vac | 1 / 8 " BSP |
| DM14 | 1 | 45 mm | 24 Vdc | 1 / 8 " BSP |
| DM21 | 2 | 63 mm | 230/50 or 240/60 Vac. | ¼" BSP |
| DM22 | 2 | 63 mm | 110/50 or 120/60 Vac | ¼" BSP |
| DM23 | 2 | 63 mm | 24/50 or 24/60 Vac | ¼" BSP |
| DM24 | 2 | 63 mm | 24 Vdc | ¼" BSP |
| DM31 | 3 | 90 mm | 230/50 or 240/60 Vac. | ¼" BSP |
| DM32 | 3 | 90 mm | 110/50 or 120/60 Vac | ¼" BSP |
| DM33 | 3 | 90 mm | 24/50 or 24/60 Vac | ¼" BSP |
| DM34 | 3 | 90 mm | 24 Vdc | ¼" BSP |
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