Flowserve SNA250 User Manual

Automax Valve Automation Systems

Installation, Operation and Maintenance Instructions

Flowserve Corporation 1350 N. Mountain Springs Parkway 1978 Foreman Dr.
Flow Control Division Springville, Utah 84663-3004 Cookeville, TN 38501
www.flowserve.com Phone: [phone] Phone: [phone]

SNA250 / SNA300

All actuators are factory lubricated for life, but still should be
protected from the elements and stored indoors until ready for
use. The ports of the actuator are plugged as supplied from
the factory. If actuators are stored for a long period of time
prior to installation, the units should be stroked periodically
to prevent the seals from taking a set.

Prior to assembly, check the mounting surfaces, the stem
adaptor and the bracket to assure proper fit. Manually open
and close the valve to insure freeness of operation. Be sure
the valve and Automax actuator rotate in the same direction
and are in the same position (i.e., valve open, actuator open).
Secure the valve with the stem vertical. Bolt the bracket to the
valve and place the stem adaptor on the valve stem. Position
the actuator over the valve and lower to engage the stem
adaptor to the actuator shaft.

Continue to lower until the actuator seats on the bracket
mounting surface. In order to align the bolt holes, it may be

L

L/2

necessary to turn or stroke the actuator a few degrees and/or
adjust the actuators travel stops. Bolt the actuator to the bracket.

After consulting the valve manufacturer’s recommendations,
adjust the travel stop bolts of the actuator for the proper open
or closed valve position. Adjust the Stop Bolt (8) until the
desired travel is obtained and reinstall O-ring (10) and Nut (9).
Pneumatically stroke the actuator several times to ensure
proper operation with no binding of the stem adaptor. If the
actuator is equipped with an UltraSwltch or other accessories,
adjust them at this time.

To prolong actuator life use only clean, dry plant air. Lubricated air is
not required, however it is recommended particularly for high cycle
applications.

CAUTION: Do not use lubricated air with positioners.

Dimensional Information

MODEL SNA250 SNA300
(DA & SR) 27.32 32.60

A

180° 39.14 44.00

B 4.250 5.000
C 5/8 - 11x.63 5/8 - 11x.86
D 2.87 N/A
E 1.850 N/A
F 1.81 2.50
G 11.02 13.39
H(NPT) 1/2 1/2
J 5.91 6.30
K 11.02 13.39
L 1.181 1.181
M 5.118 5.118
N➁➂ 10 - 24 10 - 24
OØ 2.20 2.44
P 1.969 1.969
PP 0.98 0.98
QØ 3.75 3.75
R 1.65 1.65
S 0.24 N/A
Wts. lbs. (DA) 137 217
Wts. lbs. (SR) 172 288
Volume (IN
Volume (IN

Notes:
➀ Actuators shown in the full clockwise (CW) position as viewed from
the accessory side.
➁ Accessory mounting holes not for gear override or stop block.
Consult factory.

➂ Use studs only to mount. Bolts are not recommended.
④ Air consumption per 90° = V Supply Pressure + 14.7

(Standard cubic feet) 1728 14.7

3

) CW 757 1403

3

) CCW 720 1019

(

)

FCD AXAIM0005-00 (LMR0014-1) (AUTO-5) 03/05 Page 1 of 4

©

2005, Flowserve Corporation, Printed in USA

Automax Valve Automation Systems

Installation, Operation and Maintenance Instructions

Flowserve Corporation 1350 N. Mountain Springs Parkway 1978 Foreman Dr.
Flow Control Division Springville, Utah 84663-3004 Cookeville, TN 38501
www.flowserve.com Phone: [phone] Phone: [phone]

Operation (as viewed from top of actuator)

Double Acting

Applying air pressure to Port 1 drives the pistons Applying air pressure to Port 2 drives the pistons
outward, which turns the pinion counterclockwise as inward, which turns the pinion clockwise as the air
the air volume on the outside of the pistons exhausts volume on the inside of the pistons exhausts through
through Port 2. Port 1.

Spring Return (Fail CW)

Applying air pressure to Port 1 drives the pistons Exhausting the air pressure from Port 1 allows
outward, which compresses the springs and turns stored energy of the springs to drive pistons inward,
the pinion counterclockwise as the air volume on the turning the pinion clockwise. Air volume on outside
outside of the pistons exhausts through Port 2. of pistons vents through Port 2.

Spring Return (Fail CCW)

Applying air pressure to Port 1 drives the pistons Exhausting the air pressure from Port 1 allows stored
outward, which compresses the springs and turns energy of the springs to drive pistons inward, turning
the pinion clockwise as the air volume on the outside the pinion counterclockwise. Air volume on outside of
of the pistons exhausts through Port 2. pistons vents through Port 2.

FCD AXAIM0005-00 (LMR0014-1) (AUTO-5) 03/05 Page 2 of 4

©

2005, Flowserve Corporation, Printed in USA