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Dual Safety Valves

Safety Department

Stamping Press



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Stampers Store
Dual Safety Valves Pneumatic Press Clutch Valves 
Noblesville, Indiana
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Stampers Store
Metal Stamping Air Press Valves Monitoring System Blocks

GPA Dual Safety Valves

GPA Safety Valves are the most cost effective way to protect your pneumatically actuated press clutch against malfunction or accidental operation due to valve failure.

GPA's MEP-A are redundant (double-body), parallel flow pneumatically actuated valves, rated to limit in case of malfunction the residual pressure to values under 3% of the inlet pressure. 

Their inherent dynamic monitoring system blocks valve operation safety in case an inner leakage occurs, also if very low and not detectable by usual position sensors. 

A phase difference between the two bodies of a few tenths of a second causes the self-locking of the valve, which cannot be inserted back until the safe running in the rest position will be restored (delivery sealed and parallel exhaust of both bodies).

Reset is automatic when the normal function is restored in the stand by position. An auxiliary air monitoring system with manual reset can be actuated by two pressure switches, delivered as an option, mounted on the relevant connections.

Dual Safety Valves Definition

MEP-A is a series of safety pneumatic air valves designed with an intrinsically dynamic safety control system. These are 3 way 2 position NC active components for compressed air powered single acting actuated control.

To achieve their safety duties according to effective standards, such as EN 692 for CEE countries, these pneumatic air valves must be redundant (double-body) and equipped with a dynamic failure monitoring device. They now spread in four models from nominal size 10 to 40, all with BG approval.

Dual Safety Valves Construction

Function

3/2 NC

Construction Type

poppet

Pilot system

electopneumatic inter

Fluid

filtered and lubricated air

Materials

body aluminum gaskets polyurethane and NBR

Connectors

with varistors

Mounting Position

vertical pilots

Temperature Range

-10șC + 50șC

Monitoring Circuit

inherent, dynamic

Reset

automatic

Specifications

Model

Nominal Size

Connections

Working Pressure

Operations

Mass

Power consumption
(each coil)

 

A

P

R

min psi

max psi

no./1'

kg

DC W

AC(VA) inrush

AC(VA) holding

313MEP-A-50

10

1/2"

3/8"

1"

30

120

200

2.2

6

16

10

314MEP-A-52

20

3/4"

1/2"

1"

30

120

180

3.8

9

23

14

316MEP-A-50

30

1"

3/4"

1-1/2"

30

120

160

7.5

9

23

14

How it works:

Operation Diagram A  Click to see the valve cutaway view  Click to see safety valve diagram

The spring loaded pilots (3-4) of solenoid (1-2) will prevent air flow through passages (5-6) into pneumatic valve chambers (9-10). Valve connecting rods (13-14) will cause the poppets (15-16) to remain in a closed position due to incoming air pressure and combined spring pressure (21-22), outlet (A) unpressurized, remains connected to open exhaust (R).

Operation Diagram B Click to see the valve cutaway view  

Energizing both solenoids (1-2) simultaneously will cause the cores (3-4) to shift exhausts (7-8) and open inlets (5-6). The charged pressure in (5-6) will flow to the piston chambers (9-10) and cause the connecting rods (13-14) to shift downward. This will allow the incoming line pressure (P) to flow through outlet (A) via passage (23-24) while simultaneously closing the path to the exhaust port (11-12).

Operation Diagram C Click to see the valve cutaway view

If only one of the solenoids is de-energized (2), the de-energized pilot (4) by closing inlet (6) will connect the piston chamber (9) to exhaust (8). The valve element (13) will be kept pressed upward by spring pressure (21) as well as inlet pressure (P). The poppet (15) will remain closed maintaining an open path (11) to exhaust. The connecting rod (14) will cause the air to be exhausted through path (11). Pressure in channel (6), detectable by connection (CP), will be exhausted in a few seconds. The energized pilot (2) will then prevent the output from being engaged as a result of its internal pneumatic energy being constantly exhausted. The valves, therefore, continue to internally monitor themselves with each operation.

Technical Drawings - Read with the chart below.

313 MEP-A  Click
314 MEP-A  Click
316 MEP-A  Click

 

A

P

R

B

C

D

E

F

G

H

I

L

N

S

T

U

V

W

Z

CP

313 MEP-A-50

1/2"

1/2"

1"

79

60

40

115

100

104

202

17

84

26

25

34.5

120

3

3

-

1/8"

314 MEP-A-52

3/4"

3/8"

1"

79

58.2

40

113

100

104

202

17

84

24.2

25

34.5

120

3

3

-

1/8"

316 MEP-A-50

1"

1/2"

1-1/2"

104

63

40

166

120

154

239

8

104

35

20

43.5

1705

7

7

7

1/8"


For international shipping, please call (800) 276-5467

Customer must provide Federal ID Number and Shipping Account number for customs
 

GPA Dual Valve Pricing
For valves larger than 1 inch please call us to discuss your application.
Without Muffler

Valve Name Valve Size Part Number Price Weight Add to Cart
313 MEP-A-50 1/2 inch 56-3010-110 $779.10 8

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314 MEP-A-52 3/4 inch 56-3010-220 $965.30 10

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316 MEP-A-50 1 inch 56-3010-330 $1,421.00 14

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With Muffler
313 MEP-A-50 1/2 inch 56-3010-111 $857.50 8

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314 MEP-A-52 3/4 inch 56-3010-221 $1,043.70 10

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316 MEP-A-50 1 inch 56-3010-331 $1,519.00 14

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Pressure Fault Monitor switch for any of above valves:
$120.00

24VDC Sol Kit (2 per valve) for any of above valves:
$165.00

GPA Dual Safety Valve Repair Kits (2 per valve)
$313.00 for 1/2" Valve
$369.00 for 3/4" Valve
$467.00 for 1" Valve

Valve Wiring Box
$250.00


Call Stampers Store if  you prefer to order by phone, 1-800-276-5467.

Have questions or need help?  Please use our contact form to send your request and we will call you ASAP, or call us toll free at 800-276-5467.
 
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Updated January 28, 2014
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