Product Overview

Pneumatic angle seated valve has small flow resistance, large flow and no water hammer, widely used
in machinery and electronics industry, petrochemicals, energy and metallurgy, urban construction and
environmental protection as well as other industries like pharmaceutical, textile, dyeing and printing, 
tobacco, rubber, etc., owning obvious unique advantages in the automatic control of fluid.

Features

01. Nominal pressure: PN16bar
02. Applicable medium temp.: Ⅲb: -40～150℃, Ⅳb: -40～250℃
03. Ambient temp.: -30～60℃
04. Valve body material: Normal---SS304 (code: B)
                                        special---SS316 (code: R), SS316L (code: L)
05. Sealing material: Normal---PTFE (code: P) (medium temp.: Ⅲb: -40～150℃)
                                  special---PPL (code: P) (medium temp.: Ⅳb: -40～250℃)
06. Sealing material of cylinder piston: Normal---NBR (code: N)
                                                               special---VITON (code: V) 
07. Leakage: 0ml/min
08. Control air source pressure: Neutral gas, normal 5～8bar, special 3～5bar
09. Long life: Service life is 2～5 times longer than solenoid valve and 10～20 times longer than 
      pneumatic ball valve
10. Small flow resistance: Adopt the design concept of reducing flow resistance
11. Low cost: 30～50% cheaper than pneumatic ball valve 
12. Large flow: 1.5～2 times larger than solenoid valve
13. Water Hammer free: Fast open/closed speed, unique structure can eliminate 
      water hammer
14. Back pressure resistance: The maximum back pressure can reach 10bar (DN15)
15. High frequency: Applicable for high frequency working conditions, the maximum
      action frequency is 20 times/min
16. Wide application: No special requirements for cleanness and kinematic viscosity of
      the medium 
17. With visual valve position indicator
18. The flow direction of medium should be consistent with the arrow direction on the 
      valve body
19. Manual device and valve position signal output device optional 
20. Mounted at any angle, keep cylinder vertically upward&installed horizontally 
      which may extend life span 

Protection cover selection principle

1. Double acting R type stainless steel actuator must be equipped with protection cover 
2. Single acting normally open R typestainless steel actuator must be equipped with protection cover 
3. Single acting normally closed type actuator can be optionally equipped with protection cover
4. L type actuator without protection cover

Structure Diagram

Parameter and Dimension 【Equipped with RQ Series Actuator, PN16bar】

Notes:

1. The thread connection is ZG=PT=Rc by default and can be customized according to users´ requirements, such as G=Rp, NPT and so on.
2. The flange is manufactured according to JB/T79-1994 standard by default and can also be manufactured according to the standards specified by users, such as GB/T9124, HG/T20592, ANSI, JIS, DIN and other standards.  
3. *indicates aluminum alloy actuator.
4. The configuration of the above cylinder is for medium pressure: 0~8bar, for 8~16bar type, actuator should be configured with a one-increment larger cylinder.

Parameter and Dimension 【Equipped with LA/LQ Series Actuator, PN16bar】

Notes:

1. The thread connection is ZG=PT=Rc by default and can be customized according to users´ requirements, such as G=Rp, NPT and so on.
2. The flange is manufactured according to JB/T79-1994 standard by default and can also be manufactured according to the standards specified by users, such as GB/T9124, HG/T20592, ANSI, JIS, DIN and other standards.  

Control Schematic Diagram 

1. Normally closed single acting type control principle and air source wiring diagram (diagram 1) 

Notes:

(1) For pneumatic solenoid valve, please choose 3/2 way, e.g. our Z1732-04 solenoid valve.
(2) Actuator air inlet 2 connects to air source. Install silencer at air-vent 1.

2. Normally open single acting type control principle and air source wiring diagram (diagram 2) 

Notes:

(1) For pneumatic solenoid valve, please choose 3/2 way, e.g. our Z1732-04 solenoid valve.
(2) Actuator air inlet 1 connects to air source. Install silencer at air-vent 2.

3. Double acting type control principle and air source wiring diagram (diagram 3) 

Notes:

(1) For pneumatic solenoid valve, please choose 5/2 way, e.g. our Z1753-04 solenoid valve.
(2) When air enters air inlet 1, pneumatic valve closes, port 2 is air vent. When port 2 becomes air inlet, port 1 is air vent, pneumatic valve opens.

 

Note: In explosive atmosphere, please select explosion-proof solenoid valve! 

Exploded Diagram&Component and Material Table

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YS, YK, YH, YF Series Stainless Steel Pneumatic Angle Seat Valve

The BEST AUTOVALVE YS, YK, YH, and YF Series Stainless Steel Pneumatic Angle Seat Valves are designed for automatic control of industrial fluids. The series offers multiple connection configurations, actuator options, and valve operating modes to meet different installation and process requirements.

Available connection types include YS threaded, YK clamp, YH butt-weld, and YF flanged. The valve can be configured for normally closed, normally open, three-way directional, or adjusting applications, depending on the selected model and control arrangement.

The valve features a compact angle-seat structure, low flow resistance, and a visual valve position indicator. PTFE is the standard sealing material, while PPL is available for higher-temperature applications. SS304 is the standard valve body material, with SS316 and SS316L available as special options. WCB is also listed in the product coding system.

Key Features

• Four Connection Types: YS threaded, YK clamp, YH butt-weld, and YF flanged configurations.

• Multiple Operating Modes: Normally closed, normally open, three-way directional, and adjusting types.

• Stainless Steel Construction: Standard SS304, with SS316 and SS316L options.

• Sealing Options: PTFE for standard temperature applications and PPL for higher-temperature applications.

• Pneumatic Actuation: Available with different actuator configurations, including RQ and LA/LQ series.

• Visual Position Indicator: Provides a visible indication of valve position.

• Optional Accessories: Manual operating device and valve position signal feedback device.

• High-Frequency Operation: Maximum operating frequency of 20 cycles per minute, according to the manual.

• Flexible Installation: Can be installed at different angles. For horizontal installation, the cylinder should face upward to help extend service life.

• Multiple Control Arrangements: Single-acting normally closed, single-acting normally open, and double-acting configurations are described in the manual.

Technical Specifications

Item	Specification
Product Series	YS / YK / YH / YF
Product Type	Pneumatic Angle Seat Valve
Standard Body Material	SS304
Optional Body Materials	SS316, SS316L
Additional Material Listed in Coding System	WCB
Standard Sealing Material	PTFE
Special Sealing Material	PPL
Piston Seal	NBR (normal), VITON (special)
Operating Modes	Normally Closed, Normally Open, Three-Way, Adjusting
Normal Pressure	0–16 bar
Special Pressure	0–25 bar
Medium Temperature	-29°C to 150°C; 150°C to 250°C
Ambient Temperature	-30°C to 60°C
Normal Control Air Pressure	5–8 bar
Special Control Air Pressure	3–5 bar
Maximum Operating Frequency	20 cycles/min
Position Indication	Visual indicator
Optional Accessories	Manual device, valve position signal feedback device

Connection Types

Series	Connection Type	Description
YS	Threaded	Internal threaded connection
YK	Clamp	Clamp connection
YH	Butt-Weld	Butt-welding connection
YF	Flanged	Flanged connection

The threaded connection is ZG (PT/Rc) by default. G (Rp), NPT, and other thread standards can be customized.

The standard flange is manufactured according to JB/T79-1994. Other standards, including GB/T9124, HG/T20592, ANSI, JIS, and DIN, can be specified.

Operating Modes and Model Coding

The instruction manual lists the following valve position codes:

Code	Operating Mode
1	Normally Closed
2	Normally Open
3	Three-Way
311	Three-Way Directional, Normally Closed
312	Three-Way Directional, Normally Open
315	Three-Way Diverting Type
3151	Three-Way Diverting Type, Normally Closed
3152	Three-Way Diverting Type, Normally Open
41	Adjusting Type, No Signal Output
42	Adjusting Type, With Signal Output

The manual also identifies single-acting and double-acting actuator configurations. Please confirm the required operating mode, signal arrangement, and actuator type when ordering.

Body and Sealing Material Options

Valve Body Materials

Material Code	Material
B	SS304
R	SS316
L	SS316L
Q	WCB

Valve Sealing Materials

Material Code	Material	Applicable Temperature in Coding System
P	PTFE	-29°C to 150°C
P	PPL	150°C to 250°C

Piston Sealing Materials

Material Code	Material
N	NBR
V	VITON

The same code P is used for both PTFE and PPL in the manual. Confirm the complete material specification before ordering.

Flow Capacity

The following table lists the orifice sizes and Kv values shown in the manufacturer's dimensional tables.

Nominal Size	Orifice (mm)	Kv (m³/h)
DN15	15	6.9
DN20	20	9.3
DN25	25	22.2
DN32	32	32.1
DN40	40	49.0
DN50	50	64.2
DN60	60	77
DN65	65	105
DN80	80	168
DN100	100	306

Dimensions with RQ Series Actuators

The following dimensions are taken from the manual's RQ actuator table. Dimensions are in millimeters unless otherwise indicated.

YS – Threaded Type

Model	L	H	B	Thread	Cylinder
YS-15	85	137	172	ZG1/2"	L50
YS-20	95	145	178	ZG3/4"	L50
YS-25	105	165	210	ZG1"	L50
YS-32	120	180	220	ZG1¼"	L63
YS-40	130	190	228	ZG1½"	L63
YS-50	150	245	268	ZG2"	L80
YS-65	185	272	282	ZG2½"	L80
YS-80	220	302	362	ZG3"	L100
YS-100	235	395	420	ZG4"	L125

YK – Clamp Type

Model	L	H	B	E	D	Cylinder
YK-15	120	137	180	64	43.5 / 50.5	L50
YK-20	140	145	185	64	43.5 / 50.5	L50
YK-25	160	183	220	64	43.5 / 50.5	L50
YK-32	175	210	240	80	43.5 / 50.5	L63
YK-40	190	260	250	80	43.5 / 50.5	L63
YK-50	210	300	320	100	56.5 / 64.0	L80
YK-60	210	340	330	100	70.5 / 77.5	L80
YK-65	225	375	380	100	83.5 / 91.0	L80

YH – Butt-Weld Type

Model	L	H	B	d	D	Cylinder
YH-15	100	137	175	15	21	L50
YH-20	120	145	180	20	25	L50
YH-25	140	185	215	25	33	L50
YH-32	155	210	235	35	41	L63
YH-40	170	260	245	38	45	L63
YH-50	190	300	325	48	57	L80
YH-65	200	350	325	68	–	L80
YH-80	220	380	385	82	92	L100
YH-100	250	400	412	98	108	L125

YF – Flanged Type

Model	L	H	B	Flange Standard	Cylinder
YF-15	120	137	180	JB/T79-1994, PN16	L50
YF-20	130	145	185	JB/T79-1994, PN16	L50
YF-25	140	185	220	JB/T79-1994, PN16	L50
YF-32	150	210	240	JB/T79-1994, PN16	L63
YF-40	180	260	245	JB/T79-1994, PN16	L63
YF-50	195	280	265	JB/T79-1994, PN16	L80
YF-65	230	300	280	JB/T79-1994, PN16	L80
YF-80	250	330	320	JB/T79-1994, PN16	L100
YF-100	280	350	360	JB/T79-1994, PN16	L125

Dimensions with LA/LQ Series Actuators

The manual also provides a separate dimensional table for LA/LQ actuator configurations. The following values are reproduced from that table.

Model	L	H	B	E	Connection	Cylinder
YS-15	68	138	133	62	ZG1/2"	R50
YS-20	75	147	137	62	ZG3/4"	R50
YS-25	90	154	145	62	ZG1"	R50
YS-32	115	201	188	76	ZG1¼"	R63
YS-40	115	207	190	76	ZG1½"	R63
YS-50	135	213	196	96	ZG2"	R80
YS-65	185	280	252	96	ZG2½"	R80
YS-80	220	320	280	114	ZG3"	R100
YS-100	235	350	300	168	ZG4"	R125*
YK-15	120	120	160	62	Clamp	R50
YK-20	140	130	165	62	Clamp	R50
YK-25	160	160	185	62	Clamp	R50
YK-32	175	195	220	76	Clamp	R63
YK-40	190	245	230	76	Clamp	R63
YK-50	210	285	280	96	Clamp	R80
YK-60	210	350	320	96	Clamp	R80
YK-65	225	370	360	96	Clamp	R80
YH-15	100	120	155	62	Butt-weld	R50
YH-20	120	130	160	62	Butt-weld	R50
YH-25	140	150	180	62	Butt-weld	R50
YH-32	155	195	215	76	Butt-weld	R63
YH-40	170	245	225	76	Butt-weld	R63
YH-50	190	295	282	96	Butt-weld	R80
YH-65	200	385	340	96	Butt-weld	R80
YH-80	220	400	360	114	Butt-weld	R100
YH-100	250	410	385	168	Butt-weld	R125*
YF-15	120	145	185	62	Flanged	R50
YF-20	130	155	188	62	Flanged	R50
YF-25	140	165	208	62	Flanged	R50
YF-32	150	195	225	76	Flanged	R63
YF-40	180	205	240	76	Flanged	R63
YF-50	195	228	265	96	Flanged	R80
YF-65	230	264	290	96	Flanged	R80
YF-80	250	300	330	114	Flanged	R100
YF-100	280	320	350	168	Flanged	R125*

The manual marks R125 with an asterisk indicating an aluminum alloy actuator.*

Installation and Operating Notes

• The medium flow direction must match the arrow marked on the valve body.

• The valve can be installed at different angles. For horizontal installation, keep the cylinder facing upward.

• The standard actuator configuration is single-acting unless otherwise specified; double-acting operation is available.

• The manual specifies a 3/2-way pneumatic solenoid valve for single-acting control and a 5/2-way solenoid valve for double-acting control.

• For special pressure ranges, the actuator cylinder may need to be one size larger. Confirm actuator sizing with the manufacturer.

• In explosive atmospheres, select an explosion-proof solenoid valve.

• The manual recommends considering this valve type for applications with high action frequency or where conventional solenoid or electric valves do not meet site requirements.

Quality Warranty

The product carries a one-year warranty under the technical conditions specified in the instruction manual, effective from the date of delivery. Faults caused by user operation or installation are excluded from warranty coverage, although technical assistance will be provided.