Rack & Pinion · ISO 5211 · Double/Single Acting · ±5° Adjustment

AT Type Pneumatic Actuators for Quarter-Turn Valve Automation

Aluminum alloy body with hard anodized finish, available in double acting and spring return models — conforming to NAMUR, ISO 5211 and DIN 3337 with anti blow-out drive pinion and Namur solenoid valve interface.

Overview

AT type pneumatic actuator is one type of actuator to open, close or adjust the valve, which is driven by compressed air. It is also called as air operator or air equipment. Normally, AT type pneumatic actuator can be divided into single-acting pneumatic actuator and double-acting pneumatic actuator. AT pneumatic actuator is one automatic unit of actuator and regulating mechanism. The actuator includes diaphragm type, piston type, scotch yoke type and rack-and-pinion type according to structure. The rack-and-pinion type actuator is featured with simple structure, reliable action and safe & explosion proof, it is widely applicable to working condition that require high safety specifications, such as power plant, chemical industry, oil refining and etc. AT type pneumatic actuator operated valve is driven by compressed air, and it is the drive device for starting and closing angle stroke valves such as ball valve and butterfly valve. Flowspec Luokai can manufacture the AT type pneumatic actuator according to the standard of NAMUR, ISO5211 and DIN3337 with aluminum alloy body and stainless steel materials. Welcome to contact us for detailed information and best quotes if you have any questions or inquiries.

1. Features

Mounting to valve either directly or via bracket
Conforming to European and International Standard EN ISO 5211, preferred dimensions
Double rack & pinion design
Double acting or Spring return models utilize the same compact body design
Aluminum body, hard anodized externally and internally, for corrosion and wear resistance
Adjustable travel stops
Safe end cover bolting requiring no special tools.
Anti blow-out drive pinion.
Namur air connection can be easily mounted with solenoid valve.
Parallel and diagonal, double square(star) drive.
Travel adjustment (at each end) ±5°.
Easy field conversion between double acting and single acting models.

2. Working Principle

When the compressed air enters the pneumatic actuator through Nozzle A, the air will drive the double piston straightly move towards both ends of the cylinder and the piston rack will drive the gear of the rotary shaft by 90 degrees counterclockwise — the valve will be opened. The air in both ends is discharged through Nozzle B.
When the compressed air enters through Nozzle B, the air drives the double piston to move towards the middle position and the piston rack drives the gear by 90° clockwise — the valve is closed. Air in the middle is discharged through Nozzle A.
Single acting (spring return): Nozzle A is air inlet, Nozzle B is air outlet (muffler installed). When Nozzle A inlets air, the valve opens; when air source is cut off, the valve closes by spring force.

3. Standards / Specifications

Medium used: clean, dry and non-corrosive compressed air
Working pressure of air source: 2.5 bar (36psi) to 8 bar (116psi)
Temperature of working environment: standard: -20 ~+80 deg C
High temperature type: -20 ~+180 deg C (the temperature can reach 200 in short time)
Rotary angle: 90° ± 5°
Electromagnetic valve power supply: AC220V/DC24V, or according to customers’ needs
Model: AT series

4. Applications

Ball valve actuation
Butterfly valve actuation
Plug valve actuation
Power plant
Chemical industry
Oil refining
Long-distance pipeline control
Automatic industrial pipelines

AT Pneumatic Actuator — Components Material

AT Pneumatic Actuator — Output Torque & Specifications

Components Material

No	Name	Qty	Standard Material	Optional Material
1	Bolt	8	Stainless Steel
2	Bolt Washer	8	Stainless Steel
3	Left Cover	1	Aluminum Die Casting	Stainless Steel
4	Spring Components	5-12	Alloy Spring Steel
5	Piston Ring	2	POM
6	O-Ring (piston)	2	NBR
7	Piston	2	Aluminum Die Casting
8	Guide Ring	2	PA66
9	Bearing (output shaft bottom)	1	POM
10	O-Ring (output shaft bottom)	1	NBR	FPM / Silicone
11	Output Shaft	1	Carbon Steel	Stainless Steel
12	Cam	1	Stainless Steel
13	Gasket	1	POM
14	Bearing (top of shaft)	1	POM
15	O-Ring (top of shaft)	1	NBR	FPM / Silicone
16	Nut	2	Stainless Steel
17	Adjustment Bolt	2	Stainless Steel
18	Gasket	2	Stainless Steel	FPM / Silicone
19	O-Ring (adjusting bolt)	2	NBR	FPM / Silicone
20	O-Ring (cover)	2	NBR	Stainless Steel
21	Right Cover	1	Aluminum Die Casting	FPM / Silicone
22	Plug	1	NBR	Stainless Steel
23	Block	1	Aluminum Extrusion
24	Gasket	1	POM
25	Gasket	1	Stainless Steel
26	Shaft Ring	1	Stainless Steel
27	Indicator Supporting Structure	1	ABS
28	Indicator Main Body	1	ABS
29	Bolt	1	ABS

AT Pneumatic Actuator — Dimensions and Connection (mm)

Dimensions and Connection (mm)

Model	AT042	AT050	AT063	AT075	AT088	AT100	AT115	AT125	AT145	AT160	AT190	AT210	AT240	AT270	AT300	AT350	AT400
ISO Flange	F03/F05	F03/F05	F03/F05	F05/F07	F05/F07	F07/F10	F07/F10	F07/F10	F10/F12	F10/F12	F12/F14	F12/F14	F16	F16	F16	F16/F25	F16/F25
A	122	143	162	212	248	270	318	345	408	440	530	592	670	723	870	935	1035
B	55	68	84	100	115	126	145	157	178	196	233	255	292	332	355	410	466
C	20	20	20	23	23	23	23	33	33	33	33	33	33	33	33	33	33
D	18	18	19	20	20	20	20	30	30	30	30	30	25	25	25	25	25
E	12	12	16	16	19	19	24	24	29	29	38	38	48	48	48	48	48
F	33	40.5	46	52	56	67	78	80	91	100	112	121	130	147	173	195	260
G	24	29	36	41.5	49	56	64	71	80	88	105	116	130	147	161	190	260
K	10	11	11	17	17	17	17	27	27	27	27	27	36	36	36	36	36
L	50	80	80	80	80	80	80	80	130	130	130	130	130	130	130	130	130
M	30	30	30	30	30	30	30	30	30	30	30	30	30	30	30	30	30
N	4-M5×9	4-M5x9	4-M5×9	4-M5×9	4-M5×9	4-M5×9	4-M5×9	4-M5×9	4-M5×9	4-M5×9	4-M5×9	4-M5×9	4-M5×9	4-M5×9	4-M5×9	4-M5×9	4-M5×9
O	50	50	50	70	70	102	102	102	125	140	140	140	165	165	165	254	254
P	4-M6×9	4-M6x9	4-M6x9	4-M8×12	4-M8×12	4-M10×15	4-M10×15	4-M10×15	4-M12×18	4-M16×24	4-M16×24	4-M16×24	4-M20×30	4-M20×30	4-M20×30	8-M16×24	8-M16×24
O1	36	36	36	50	50	70	70	70	102	102	125	125	—	—	—	165	165
P1	4-M5x8	4-M5x8	4-M5x8	4-M6×9	4-M6×9	4-M8×12	4-M8×12	4-M8×12	4-M10×15	4-M10×15	4-M12×18	4M12×18	—	—	—	4-M20×30	4-M20×30
Q	9	11	14	14	17	17	22	22	27	27	36	36	46	46	46	46	46
V	20	24	24	24	24	24	24	24	24	24	24	24	24	40	40	40	40
W	29	36	36	36	36	36	36	36	36	36	36	36	36	45	45	45	45
Y	4-M4×9	4-M5x9	4-M5×9	4-M5×9	4-M5×9	4-M5×9	4-M5×9	4-M5×9	4-M5×9	4-M5×9	4-M5×9	4-M5×9	4-M5×9	4-M6x10	4-M6×10	4-M6×10	4-M6×10
Z	G1/8″	G1/8″	G1/8″	G1/8″	G1/8″	G1/4″	G1/4″	G1/4″	G1/4″	G1/4″	G1/4″	G1/4″	G1/4″	G3/8″	G1/2″	G1/2″	G1/2″

Double Acting Output Torque (Nm)

Model	2.5bar	3.0bar	3.5bar	4.0bar	4.5bar	5.0bar	5.5bar	6.0bar	7.0bar	8.0bar
AT042D	3.6	4.3	5	5.7	6.4	7.3	8	8.7	10	11.6
AT050D	8.3	10.0	11.6	13.3	15.0	16.6	18.3	19.9	23.3	26.6
AT063D	14.7	17.6	20.5	23.5	26.4	29.3	32.2	35.2	41.0	46.9
AT075D	29.1	34.9	40.7	46.5	52.3	58.2	64.0	69.8	81.4	93.0
AT088D	45.7	54.9	64.0	73.2	82.3	91.5	101	110	128	146
AT100D	66.5	79.7	93.0	106	120	133	146	160	186	213
AT115D	107	129	150	172	193	215	236	258	301	344
AT125D	138	166	194	221	249	277	304	332	387	443
AT145D	217	261	304	348	391	434	478	521	608	695
AT160D	283	340	397	453	510	567	623	680	793	907
AT190D	538	646	753	861	969	1076	1185	1292	1508	1723
AT210D	658	789	920	1052	1184	1316	1447	1579	1842	2105
AT240D	966	1160	1352	1546	1740	1933	2126	2320	2706	3093
AT270D	1468	1761	2055	2349	2642	2936	3229	3523	4110	4697
AT300D	1908	2289	2670	3052	3434	3815	4197	4578	5341	6104
AT350D	2856	3427	3998	4570	5141	5712	6283	6854	7996	9139
AT400D	3620	4343	5067	5791	6515	7239	7963	8687	10135	11583