Quick Couplings
PRODUCT RANGE
fig. 1 – MQS-A series: ISO-A MQS-N series: Standard
fig. 2 – MQS-B series: ISO-B
fig. 3 – MQS-AF series: Push-pull fig. 4 – MQS-F series: Flat Face
fig. 5 – MQS-SG, -SC, -ST series:
Screw to connect
fig. 6 – MQS-VB, -VS series:
Braking Circuit Valve
fig. 7 – MQS-CV series:
Check valves
fig. 8 – Accessories & Service Kits
Poppet and ball valves quick-couplings for agriculture and industrial applications
1) MQS-A, MQS-AP, MQS-AF and MQS-AFP families undertake to ISO 7241-A standard that defines the main performances and the geometry of connection area of nipple and coupler.
ISO 7241-A standard was introduced to guarantee the worldwide interchangeability of quick-release couplings.
• MQS-A (ISO A ) nipple and coupler connection occurs pulling back the coupler sleeve and pushing the nipple into the coupler. The disconnection occurs pulling back the cou-pler sleeve and pulling out the nipple.
• MQS-AF refers to push-pull coupler, widely used in low and medium tractors.
When bulkhead mounted on the outside sleeve, the connec-tion occurs just pushing the MQS-A nipple into the push-pull coupler. The disconnection occurs just by pulling out the nipple.
An important feature of a push-pull coupler is the breakway function that allows the automatic disconnection to prevent damage of the quick-release coupling or the hose in case of accident (i.e. a towed implement becomes unhitched). This feature is ruled by ISO 5675 standard.
• MQS-AP and MQS-AFP are recommended in case of con-nection under pressure (i.e. residual pressure due to thermal expansion).
The connection is allowed through to a micro-valve placed on the top of poppet valve capable to spill oil from the cir-cuit and then reducing the pressure.
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Ball Pull back
the sleeve Series Description Female ref Male ref Shut-off
valve
Connection Disconnection
Locking
system Specifications
fig. 9 – Example of Push-Pull coupler
fig. 10 – Example of breakaway function when Push-Pull is wall-mounted
fig. 11 – Micro valve of MQS-AFP
2) MQS-N quick-coupling refers to the oldest series introduced in the market, still very common in agriculture applications.
The ½” inch size of this series is completely interchangeable with ½” inch size of MQS-A series. Therefore Q.Safe range does not include MQS-N ½” size.
3) MQS-B quick-couplings are very similar to MQS-A series, but undertaking to ISO 7241-B standard that defines the main performances and the geometry of connection area of nip-ple and counip-pler.
MQS-B is the reference series for industrial applications.
Beside carbon steel version, brass and stainless steel versions are very common as well.
Screw-on quick-couplings for heavy duty applications
In case of severe working conditions with pressure impulses, latching balls system can suffer in terms of reliability and dura-bility because of BRINELLING.
In these working conditions screw-on quick-couplings are the most effective solution due to the large surface contact between male and female part. Therefore the mechanical stress can be reduced.
In addition screw-on quick-coupling allow the connection under pressure.
There is no international standard referring to the performanc-es and the interchangeability of any screw-on quick-coupling type.
1) MQS-SG series was originally introduced into the German mar-ket, but now is used worldwide. This has helped to resolve some issues related to pressure impulses and vibrations on heavy duty applications.
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MQS-SG
MQS-SC
MQS-ST
SCREW for German market
SCREW for hydraulic cylinders
SCREW for trucks
Q056
Q058
Q055
Q057
Ball
Poppet
Q052 Q051 Poppet
Screw-on
Screw-on latching
system
–
–
– Series Description Female ref Male ref Shut-off
valve
Connection Disconnection
Locking
system Specifications
fig. 12 – MQS- SG series (Screw for German Market)
fig. 13 - Application on hydraulic hammer
2) MQS-SC quick-coupling is specifically designed for very high pressure applications in steady conditions like hydraulic cylinders
3) MQS-ST series is commonly used in truck trailer applications.
Usually the sleeve of coupler is wing-shaped which enables easier connection to the male and female.
Flat-face quick-couplings
MQS-F was originally designed for construction equipment appli-cations in the North American market. Later ISO 16028 standards was introduced to define the main performances and the geom-etry of connection area of the nipple and the coupler.
Main features of flat-face couplings are:
• no fluid loss during disconnection
• reduced air inclusion during connection
• easy cleaining of mating surfaces
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fig. 14 – MQS- SC series (Screw for Hydraulic Cylinders)
fig. 15 - Application on hydraulic cylinders
fig. 16 - MQS – ST series (Screw for Trucks)
fig. 17 – Application on trucks
fig. 18 – MQS – F series (Flat-face) fig. 19 – Flat-face application on earth moving machines
MQS-F FLAT FACE Q041 Q039 Flat Push the male
Pull back the sleeve
Latching balls
ISO 16028 HTMA (3/8” only) Series Description Female ref Male ref Shut-off
valve
Connection Disconnection
Locking
system Specifications
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An optimized internal design of MQS-F quick-release coupling guarantees to reduce the flow distorsion, therefore minimaz-ing the pressure drops.
Braking circuit valves
1) MQS-VB series undertakes to ISO 5676 and it’s specifically designed to connect the braking circuit of the trailer to the hydraulic system of the tractor.
2) MQS-VS valve has the same function of MQS-VB but with screw-on locking system.
MQS-VB
MQS-VS
BRAKING CIRCUIT VALVE
AGRICULTURE VALVE
Q048
Q050
Q047
Q049
Flat
Flat
Pull back the sleeve
Screw-on
Latching balls Screw-on
latching system
ISO 5676
– Series Description Female ref Male ref Shut-off
valve
Connection Disconnection
Locking
system Specifications
fig. 20 – Braking circuit valve
fig. 22 – Tractor and trailer
fig. 21 – Agriculture valve
Q.Safe Part Numbering System
DIGIT “0”
Q Quick-release coupling
DIGIT “1”
Male according to ISO 7241-1 standards, series A - Poppet valve Male according to ISO 7241-1 standards, series A - Ball valve
Male according to ISO 7241-1 standards, series A - Connectable under pressure Female according to ISO 7241-1 standards, series A - One-way release, poppet valve Female according to ISO 7241-1 standards, series A - One-way release, ball valve Female according to ISO 7241-1 standards, series A - One-way release, connectable under pressure
Female according to ISO 7241-1 standards, series A - Two-ways release, poppet valve Female according to ISO 7241-1 standards, series A - Two-ways release, connectable under pressure
Male interchangeable with series 4000 - Poppet valve Male interchangeable with series 4000 - Ball valve
Female interchangeable with series 4000 - One-way release, poppet valve Female interchangeable with series 4000 - One-way release, ball valve Flat-Face male according to ISO 16028
Flat face female according to ISO 16028 - With safety sleeve Male for hydraulic braking circuit according to ISO 5676 Female for hydraulic braking circuit according to ISO 5676 Screw-type male for hydraulic braking circuit
Screw-type female for hydraulic braking circuit Screw-type male for German market
Screw-type female for German market Screw-type male for hydraulic cylinder Screw-type female for hydraulic cylinder Screw-type male for truck
Screw-type female for truck
Series Description
DIGIT “4”
It indicates the material 1 steel
2 AISI 316 3 AISI 303 4 Brass 5 Aluminum DIGIT “5”
It indicates the sealing material 0 no seal
1 NBR 2 HNBR
3 FKM (viton, FPM) 4 CR (neoprene) 5 EPDM
6 FFPM (Kalrez) 7 PTFE
8 VMQ (silicone rubber) 9 AU (polyurethane) DIGIT “6” – “7”
It indicates the termination end type
114 0 1 2 3 4 5 6 7 8 9 - 10 11 - 12 13
6 7
-4 5 8 9 10 11 - 12 13 1 2 3
0
6 7
-4 5 8 9 10 11 - 12 13 1 2 3
0
04 05 11 12 14 19 23 28 30 34 37 77 82 87
BSP male bulkhead / Fixed female BSP DIN 3852-2 “form X” - ISO 1179-1 BSP parallel thread (60° cone BS5200)
Male metric thread (24° cone light type DIN 3861) Male metric thread (24° cone heavy type DIN 3861)
Metric male DIN 3852-11 “form E” / Metric fixed female DIN 3852-1 “form X” and “form Y”
Metric male (adjustable + non-adjustable heavy) ISO 6149-2 / Metric fixed female ISO 6149-1 JIC thread (37° cone) bulkhead
NPTF male SAE J476A / NPSM swivel female
Male O-Ring boss (non-adjustable light) SAE J1926-3 / Female port SAE J1926-1 NPTF fixed female SAE J476A
Flange (A/C and refri application) / Metric male 60° cone superlight DIN 3863 bulkhead Male bulkhead DIN (24° cone light type)
Male bulkhead BSP
Male bulkhead DIN (24° cone heavy type)
Series Description
DIGIT “8”
It indicates the thread gender 0 male
1 female DIGIT “9”
It indicates a customized version DIGIT “10” – “11”
It indicates the quick coupling size DIGIT “12” – “13”
It indicates the thread size 6 7 - 115
4 5 8 9 10 11 - 12 13 1 2 3
0
6 7
-4 5 8 9 10 11 - 12 13 1 2 3
0
6 7
-4 5 8 9 10 11 - 12 13
1 2 3 0
6 7
-4 5 8 9 10 11 - 12 13 1 2 3
0