Orifices croisés, limiteur de pression assemblage, avec clapets anti-cavitation
Function
Port Designators [ + ]
| Modifiers | Ports |
| M, M/S | Ports V1 & V2: SAE 16; Port T: SAE 12; |
Caractéristiques techniques [ + ]
Cet ensemble assure 2 fonctions. Il comporte 2 limiteurs de pression à décharges croisées entre les orifices M1 et M2. Il offre aussi une protection anti-cavitation pour les orifices M1 et M2.
- Toute contre-pression à l’orifice 2 (retour au réservoir) augmente directement la valeur de tarage de la valve dans un rapport de 1/1.
- La pression maxi est admise à l’orifice 2 . Cette valve convient aux circuits de limitation de pression à décharge croisée.
- Cette valve convient aux applications de maintien de charge.
- Cet ensemble assure la protection des pompes est des moteurs contre les pics de pression dus aux variations brusques de charges, en particulier avec les pompes à cylindrée variable dont le mécanisme de changement de cylindrée est parfois trop lent pour absorber les pics de pression.
- Cet ensemble limiteur de pression à action directe a un temps de réponse rapide qui permet de réduire les pics de pression, et un faible débit de fuite lors de la fermeture (moins de 5 gouttes/min [0,3 cm3/min] à 85% de la pression d'ouverture).
Caractéristiques [ + ]
| Type de Corps | Montage sur moteurMontage sur moteur |
| Plan de Pose | Staffa B150/B200Staffa B150/B200 |
| Capacité | 50 gpm200 L/min. |
FAQs [ + ]
Reasons to anodize:
- To increase corrosion resistance. Sun uses 6061-T651 aluminum. It is one of the most corrosion resistant aluminum alloys there is. Whether or not anodizing improves the corrosion resistance of 6061 aluminum is debatable. We have yet to have a manifold returned because of corrosion.
- Appearance (color). The 2 colors that would appeal to Sun would be blue or black. Unfortunately these are the colors that are hardest to do consistently.
- To provide a hard wear surface. Sun does not make parts-in-body valves. The manifold is just plumbing. We don't need a wear surface.
- Because everyone else does it. Bad reason.
Reasons to not anodize:
- Cost. It's another process.
- Logistics. When you make tens of thousands of manifolds a month and you anodize hundreds, it's a problem. Consistency. See above.
- Stamping. After a body is anodized you cannot do any more stamping without making a mess.
Inspection. Have you ever tried to look for burrs in a black anodized body? It's the old blackboard factory at night scenario. - Torque. You will experience an increase in breakaway torque when removing items from an anodized manifold.
- Fatigue life. This is the best reason to not anodize. Fatigue failure is a very complex phenomenon. What it takes to initiate a crack is difficult to predict. What it takes to propagate a crack is readily defined. Anodizing produces a very thin, very hard, and very brittle surface on aluminum. The first time you pressurize an anodized aluminum manifold you have initiated fatigue cracks. Whether or not the stress is enough to propagate the cracks is a matter of pressure and manifold geometry. Anodizing an aluminum manifold grossly reduces the fatigue life by anywhere from 20% to 50%.
Direct acting valves are used to prevent over pressure and pilot operated valves are used to regulate pressure. If you are unsure, use a direct acting valve. Sun's direct acting valves are very fast, dirt tolerant, stable, and robust. Sun's pilot operated valves are moderately fast, they have a low pressure rise vs. flow curve, and they are easy to adjust.
Il y a exactement 15 gouttes Sun dans un centimètre cube.
Notes [ + ]
- Important: La pression maximum du système doit être considérée avec une grande attention. La limite de pression maximum à laquelle le bloc peut être utilisé dépend de la matière du bloc, alors que le type et la dimension des orifices sont secondaires. Les blocs forés fabriqués en aluminium ne sont pas prévus pour des pressions supérieures à 210 bar (3000 psi), et ce quelles que soient les types et dimensions des orifices spécifiés.
- For detailed information regarding the cartridges contained in this assembly, click on the models codes shown in the Included Components tab.
Ressources Complémentaires [ + ]