Product Overview

Spirax Sarco PF6 Series Stainless Steel Pneumatic Piston On/Off Angle Valve is a two-port pneumatic control valve with AISI 316L stainless steel body, offering excellent corrosion resistance and structural strength. Suitable for steam, water, air, oil, gas and other industrial media. The valve operates via pneumatic signal driving the actuator piston, with spring return function. Standard models and models with flow regulator are equipped with position indicators for easy on-site valve status observation.

Action Mode Description

• Normally Closed (NC): Fluid flows from above the seat (1-2), not suitable for applications where water hammer may occur
• Normally Open (NO): Fluid flows from below the seat (2-1), suitable for liquids to prevent water hammer
• Bi-directional Normally Closed (BD): For special liquid applications requiring bi-directional flow and water hammer prevention, fluid flows from below the seat (2-1), pressure should not exceed 1 bar g when fluid flows from above the seat (1-2)

Materials and Construction

Normally Closed (NC) Structure

Normally Open (NO) Structure

Bi-directional Normally Closed (BD) Structure

Material Specifications

No.	Component	Material
1	Body	Stainless Steel AISI 316L
2	Bonnet	Stainless Steel AISI 316L
3	Plug	Stainless Steel AISI 316L
4	Plug Seal	TFM 1600
5	Stem	Stainless Steel AISI 316L
6	Stem Seal (Standard)	PTFE + V-type FKM
6	Stem Seal (Option H)	25% Carbon Graphite Filled PTFE
7*	Stem 'O' Ring	Fluorocarbon Rubber
8	Actuator Housing	30% Polyamide Glass (PA66 for H type)
9	Piston	50% Polyamide Glass
10	Piston Lip Seal	Nitrile Rubber
11	Gasket	PTFE
12	'O' Ring	Fluorocarbon Rubber

Note

*Component 7 not shown in structure diagram

Technical Specifications

Basic Parameters

Parameter	Specification
Body Material	Body, bonnet, plug, stem all Stainless Steel AISI 316L
Seal Material	Plug seal: TFM 1600; Stem seal: Standard (V-type PTFE + 25% H), High-temp (FKM carbon graphite filled PTFE); O-ring: Fluorocarbon rubber; Gasket: PTFE
Actuator Material	Housing: 30% Polyamide glass (PA66 for H type); Piston: 50% Polyamide glass; Piston lip seal: Nitrile rubber
Operating Temperature Range	Standard seal: max 180°C; High-temp seal (H type): max 190°C; Min: -10°C (consult manufacturer below this temperature)
Maximum Design Pressure	Threaded/Butt weld/Socket weld/EN 1092 flange: DN15-DN25 PN40, DN32-DN40 PN25, DN50 PN16; ASME flange: Class 150; Sanitary clamp: PN10
Max Saturated Steam Working Pressure	Standard seal: 9 bar g @ 180°C; High-temp seal (H type): 11.5 bar g @ 190°C
Leakage Rate	ASME class VI
Flow Characteristic	Quick opening
Pilot Medium	Air or water, max temperature 60°C
Pilot Valve Connection	Type 1 actuator: 1/8" BSP; Type 2/3 actuator: 1/4" BSP
Max Pilot Pressure	Type 1/2 actuator: 10 bar g; Type 3 actuator: 8 bar g
Actuator Rotation	360°

Kvs Values

Size (DN)	15 (1/2")	20 (3/4")	25 (1")	32 (1¼")	40 (1½")	50 (2")
Kvs Value	4.5	8.0	15.6	24.6	42.0	57.0

Conversion Formula

• Cv (UK) = Kv × 0.963
• Cv (US) = Kv × 1.156

Maximum Differential Pressure (△PMX)

Normally Closed (PF6_G-NC)

Type 1 Actuator (Ø45 mm)

Valve Size	Max ΔP (bar)	Min Pilot Pressure (bar)	Max Pilot Pressure (bar)
DN15 (1/2")	16	1.8	10
DN20 (3/4")	16	1.8	10

Type 2 Actuator (Ø63 mm)

Valve Size	Max ΔP (bar)	Min Pilot Pressure (bar)	Max Pilot Pressure (bar)
DN15 (1/2")	20	1.5	10
DN20 (3/4")	20	1.5	10
DN25 (1")	20	1.5	10
DN32 (1¼")	16	2.8	10
DN40 (1½")	16	2.8	10
DN50 (2")	11	2.8	10

Type 3 Actuator (Ø90 mm)

Valve Size	Max ΔP (bar)	Min Pilot Pressure (bar)	Max Pilot Pressure (bar)
DN25 (1")	20	1.0	8
DN32 (1¼")	16	2.8	8
DN40 (1½")	16	2.8	8
DN50 (2")	15	2.8	8

Normally Open (PF6_G-NO)

Type 1 Actuator (Ø45 mm)

Valve Size	Max ΔP (bar)	Min Pilot Pressure (bar)	Max Pilot Pressure (bar)
DN15 (1/2")	16	1.8	10
DN20 (3/4")	16	1.8	10

Type 2 Actuator (Ø63 mm)

Valve Size	Max ΔP (bar)	Min Pilot Pressure (bar)	Max Pilot Pressure (bar)
DN15 (1/2")	16	1.5	10
DN20 (3/4")	16	1.5	10
DN25 (1")	16	1.5	10
DN32 (1¼")	16	1.5	10
DN40 (1½")	16	1.5	10
DN50 (2")	12	1.5	10

Type 3 Actuator (Ø90 mm)

Valve Size	Max ΔP (bar)	Min Pilot Pressure (bar)	Max Pilot Pressure (bar)
DN25 (1")	16	1.0	8
DN32 (1¼")	16	1.0	8
DN40 (1½")	16	1.0	8
DN50 (2")	16	1.0	8

Bi-directional Normally Closed (PF6_G-BD)

Type 1 Actuator (Ø45 mm)

Valve Size	Max ΔP 1-2 (bar)	Max ΔP 2-1 (bar)	Min Pilot Pressure (bar)	Max Pilot Pressure (bar)
DN15 (1/2")	16	16.0	5.0	10
DN20 (3/4")	16	7.0	5.0	10

Type 2 Actuator (Ø63 mm)

Valve Size	Max ΔP 1-2 (bar)	Max ΔP 2-1 (bar)	Min Pilot Pressure (bar)	Max Pilot Pressure (bar)
DN15 (1/2")	16	16.0	3.8	10
DN20 (3/4")	16	16.0	3.8	10
DN25 (1")	16	11.0	3.8	10
DN32 (1¼")	16	6.0	3.8	10
DN40 (1½")	12	4.0	3.8	10
DN50 (2")	8	2.5	3.8	10

Type 3 Actuator (Ø90 mm)

Valve Size	Max ΔP 1-2 (bar)	Max ΔP 2-1 (bar)	Min Pilot Pressure (bar)	Max Pilot Pressure (bar)
DN25 (1")	16	14.0	3.3	8
DN32 (1¼")	16	12.0	3.3	8
DN40 (1½")	16	8.0	3.3	8
DN50 (2")	14	6.0	3.3	8

Opening/Closing Time

Test Conditions

Pilot medium pressure 6 bar, valve internal pressure 0 bar, unit: seconds

Type 1 Actuator (Ø45 mm)

Valve Size	NC Valve (Open)	NC Valve (Close)	NO Valve (Open)	NO Valve (Close)
DN15 (1/2")	0.09	0.22	0.22	0.09
DN20 (3/4")	0.09	0.22	0.22	0.09

Type 2 Actuator (Ø63 mm)

Valve Size	NC Valve (Open)	NC Valve (Close)	NO Valve (Open)	NO Valve (Close)
DN15 (1/2")	0.14	0.30	0.30	0.14
DN20 (3/4")	0.20	0.30	0.30	0.20
DN25 (1")	0.32	0.34	0.34	0.32
DN32 (1¼")	0.34	0.38	0.38	0.34
DN40 (1½")	0.34	0.38	0.38	0.34
DN50 (2")	0.36	0.38	0.38	0.36

Type 3 Actuator (Ø90 mm)

Valve Size	NC Valve (Open)	NC Valve (Close)	NO Valve (Open)	NO Valve (Close)
DN25 (1")	0.32	0.34	0.34	0.32
DN32 (1¼")	0.36	0.40	0.40	0.36
DN40 (1½")	0.40	0.46	0.46	0.40
DN50 (2")	0.40	0.46	0.46	0.40

Dimensions and Weights (Approximate)

Threaded, Socket Weld and Butt Weld Connections

Valve Size	Actuator Type & Size	A1 (mm)	B1 (mm)	C (mm)	D (mm)	Weight (kg)
DN15 (1/2")	Type 1 (45mm)	65	144	123	5	0.8
DN15 (1/2")	Type 2 (63mm)	65	192	171	5	1.2
DN20 (3/4")	Type 1 (45mm)	75	155	126	7	0.9
DN20 (3/4")	Type 2 (63mm)	75	198	176	7	1.3
DN25 (1")	Type 2 (63mm)	90	212	185	8	1.5
DN25 (1")	Type 3 (90mm)	90	223	196	8	2.0
DN32 (1¼")	Type 2 (63mm)	110	225	193	10	1.9
DN32 (1¼")	Type 3 (90mm)	110	234	202	10	2.4
DN40 (1½")	Type 2 (63mm)	120	230	198	12	2.1
DN40 (1½")	Type 3 (90mm)	120	239	207	12	2.6
DN50 (2")	Type 2 (63mm)	150	248	207	16	2.9
DN50 (2")	Type 3 (90mm)	150	257	216	16	3.3

Flanged Connection (EN 1092 and ASME 150 A4)

Valve Size	Actuator Type & Size	EN 1092 A3 (mm)	ASME 150 A4 (mm)	B3 (mm)	C (mm)	Weight (kg)
DN15 (1/2")	Type 2 (63mm)	130	139.7	218	194	2.6
DN20 (3/4")	Type 2 (63mm)	150	152.4	236	210	3.0
DN25 (1")	Type 2 (63mm)	160	165.1	239	208	3.8
DN25 (1")	Type 3 (90mm)	160	165.1	250	219	4.4
DN32 (1¼")	Type 2 (63mm)	180	184.2	252	216	5.6
DN32 (1¼")	Type 3 (90mm)	180	184.2	263	227	6.0
DN40 (1½")	Type 2 (63mm)	200	203.2	257	220	6.5
DN40 (1½")	Type 3 (90mm)	200	203.2	268	232	7.0
DN50 (2")	Type 2 (63mm)	230	228.6	275	230	8.7
DN50 (2")	Type 3 (90mm)	230	228.6	286	240	9.1

Sanitary Clamp Connection (ISO 2852)

Valve Size	Actuator Type & Size	A2 (mm)	B2 (mm)	C (mm)	E (mm)	F (mm)	Weight (kg)
DN15 (1/2")	Type 1 (45mm)	102	162	123	34	17.2	0.8
DN15 (1/2")	Type 2 (63mm)	102	210	171	34	17.2	1.2
DN20 (3/4")	Type 1 (45mm)	114	167	126	34	21.3	1.3
DN20 (3/4")	Type 2 (63mm)	114	217	176	34	21.3	1.5
DN25 (1")	Type 2 (63mm)	140	231	185	50.5	25.0	1.8
DN25 (1")	Type 3 (90mm)	140	243	196	50.5	25.0	2.4
DN32 (1¼")	Type 2 (63mm)	159	240	193	50.5	33.7	2.4
DN32 (1¼")	Type 3 (90mm)	159	251	202	50.5	33.7	2.8
DN40 (1½")	Type 2 (63mm)	159	249	198	64	40.0	2.8
DN40 (1½")	Type 3 (90mm)	159	260	207	64	40.0	3.2
DN50 (2")	Type 2 (63mm)	190	267	207	64	51.0	3.6
DN50 (2")	Type 3 (90mm)	190	279	216	64	51.0	4.0

Sanitary Clamp Connection (ASME BPE)

Valve Size	Actuator Type & Size	A2 (mm)	B2 (mm)	C (mm)	E (mm)	F (mm)	Weight (kg)
DN15 (1/2")	Type 1 (45mm)	102	162	123	25	9.4	0.8
DN15 (1/2")	Type 2 (63mm)	102	210	171	25	9.4	1.2
DN20 (3/4")	Type 1 (45mm)	114	167	126	25	15.75	1.3
DN20 (3/4")	Type 2 (63mm)	114	217	176	25	15.75	1.5
DN25 (1")	Type 2 (63mm)	140	231	185	50.5	22.1	1.8
DN25 (1")	Type 3 (90mm)	140	243	196	50.5	22.1	2.4
DN40 (1½")	Type 2 (63mm)	159	249	198	50.5	34.8	2.8
DN40 (1½")	Type 3 (90mm)	159	260	207	50.5	34.8	3.2
DN50 (2")	Type 2 (63mm)	190	267	207	64	47.5	3.6
DN50 (2")	Type 3 (90mm)	190	279	216	64	47.5	4.0

Note

• DN32 is not available with ASME BPE connection
• Clamps and clamp gaskets are not supplied

Related Components (Solenoid Valves)

Solenoid Valve Description

DM 3/2-way solenoid valves can be directly mounted on PF61G-NC, NO and BD series valves via banjo-type connection, working medium is air or water, using DIN-type connection.

Type 1 Actuator (Ø45 mm)

Model	Voltage/Frequency	Connection
DM11	230/50 or 240/60 Vac	1/8" BSP
DM12	110/50 or 120/60 Vac	1/8" BSP
DM13	24/50 or 24/60 Vac	1/8" BSP
DM14	24 Vdc	1/8" BSP

Type 2 Actuator (Ø63 mm)

Model	Voltage/Frequency	Connection
DM21	230/50 or 240/60 Vac	1/4" BSP
DM22	110/50 or 120/60 Vac	1/4" BSP
DM23	24/50 or 24/60 Vac	1/4" BSP
DM24	24 Vdc	1/4" BSP

Type 3 Actuator (Ø90 mm)

Model	Voltage/Frequency	Connection
DM31	230/50 or 240/60 Vac	1/4" BSP
DM32	110/50 or 120/60 Vac	1/4" BSP
DM33	24/50 or 24/60 Vac	1/4" BSP
DM34	24 Vdc	1/4" BSP

Selection Guide

Selection Parameters

Parameter	Options & Description
Valve Size	DN15 (1/2"), DN20 (3/4"), DN25 (1"), DN32 (1¼"), DN40 (1½"), DN50 (2")
Valve Type	P = Piston type (fixed parameter)
Flow Characteristic	F = Quick opening (fixed parameter)
Body Material	6 = Stainless steel (fixed parameter)
Connection Type	1 = Threaded (BSP or NPT); 2 = Butt weld (specify pipe type: DIN 11850/ASME B36.10/ISO 65/ISO 4200); 3 = Flanged (EN 1092 or ASME Class 150 weld neck flange); 4 = Socket weld (ASME B36.10/ISO 65 pipe); 5 = Sanitary clamp (specify pipe type: ISO 2852 or ASME BPE)
Plug Seal	G = TFM 1600 soft seal (fixed parameter)
Stem Seal	Blank = Standard V-type PTFE; H = 25% graphite filled V-type PTFE (Note: H type not suitable for sanitary clamp valves or Type 1 actuators)
Actuator Type	1 = 45mm diameter; 2 = 63mm diameter; 3 = 90mm diameter
Valve Position	NC = Normally closed; NO = Normally open; BD = Bi-directional normally closed
Options	Blank = No option; I = Limit switch (indicates valve open/close position, max rating: 500V/0.5A/30VA, only for Type 2/3 actuators, add suffix "I"); R = Flow regulator (manual control of max flow, NO valve can be manually closed, only for Type 2/3 actuators, add suffix "R")

Selection Example

Example

• Requirement: DN25 size, flanged connection EN 1092 PN40, Type 2 actuator, normally closed
• Model: PF63G-2NC
• Order Description: Spirax Sarco DN25 PF63G-2NC Stainless Steel Pneumatic Piston On/Off Angle Valve, flanged connection EN 1092 PN40

Spare Parts and Ordering

Spare Parts List

Seal component kits are available for all valve sizes and actuators, including: piston lip seal, actuator O-ring, plug soft seal (PTFE), body seal and O-ring.

Ordering Information

1. When ordering valves, specify valve size, model, connection type, actuator type, action mode, stem seal type and optional accessories (limit switch/flow regulator)
2. When ordering spare parts, specify valve size, model and date code (located on actuator label, format example: 120 = week 12 of 2000)
3. Spare parts ordering example: Seals for PF61G-2NC, date code 120

Installation and Maintenance

Installation Notes

• Valve can be installed in any orientation, actuator can rotate 360° for easy solenoid valve installation
• Normally closed (NC) type should not be used where water hammer may occur
• Bi-directional (BD) type: when fluid flows from above the seat (1-2), pressure should not exceed 1 bar g
• For operation below -10°C, consult Spirax Sarco in advance
• For detailed installation and maintenance procedures, refer to the installation and maintenance guide provided with the product