DH6/10
DH6/10 DH6/10
Pilot operated unloading relief valve (2) P T Overview The pilot operated unloading relief valve is used with either an accumulator or a two pump high-low circuit. One state being high flow low pressure and the other low flow high pressure. In the case of the accumulator circuit, when the pump discharge pressure reaches the cut-out pressure, the valve opens and the pump is unloaded. When the pressure on the accumulator side reaches the cut-in pressure, the valve is closed and the pump is loaded, pumping out the discharged oil to the Type indication accumulator side. In the case of the high-low circuit that uses two pumps, when pressure reaches the set pressure (cut-out pressure), the valve opens, pressure oil from the pumps is automatically returned to the tank and the pump is unloaded. When the pressure falls below the set pressure, the valve is closed and the pumps become automatically loaded. Pilot operated unloading relief valve (2) Pilot operated unloading relief valve Nominal dimension 35 Connection method P F = = Gasket connection type Flange connection type Series number: 10 Shape of pressure adjusting part 1 = Handle adjustment 2 = Thread adjustment (with cap) 3 = Handle with key adjustment Type of hydraulic oil No symbol = Mineral based hydraulic oil V = Phosphate ester based hydraulic oil W = Fatty ester based hydraulic oil Water-glycol based hydraulic oil Check valve provided or not No symbol = Without check valve Pressure adjustment range 80 = 2.0 to 7.9MPa (20 to 80kgf/cm 2 ) 160 = 7.9 to 15.7MPa (80 to 160kgf/cm 2 ) 315 = 15.7 to 30.9MPa (160 to 315kgf/cm 2 ) 2-37
Hydraulic symbols P X T Specifications Nominal dimension Maximum working pressure MPa (kgf/cm 2 ) 35 30.9 (315) Maximum flow rate L/min 600 Pressure ratio between cut-in and cut-out (%) 82 (Note) Mass kg Gasket connection type 17 Flange connection type (Note) Although the design value is 82%, the pressure ratio may change to approximately 78 – 86% depending on the set pressure or flow rate. Pilot operated unloading relief valve (2) Pressure increase value per turn (clockwise) of adjust thread MPa (kgf/cm 2 ) Nominal Highest dimension adjustment pressure 80 160 315 7.35 (75.0) (Note) As the above value is a calculated value, there are slight variations in the product. Flange Valve type 35 1.96 (20.0) 3.53 (36.0) 20.6MPa TFAA-40 PU35F 30.9MPa TFXA-40 When you use a flange, please place an order for the above flange type. For the dimension drawing, refer to page 16 of the appendix. Accessories Maximum working pressure Precautions in use If piping from the check valve to the accumulator (ACC) is thin and long, the difference between the cut-out pressure and cut-in pressure becomes small, causing the operation to be unstable. Install piping so that the pressure drop amount (ΔP) from the check valve to ACC is [(cut-out pressure – cut-in pressure) x 1/3]. Flange type Connection diameter 2B 2B Mass 2.6kg 2.7kg Mounting bolt Type Hexagon socket head cap thread Quantity Tightening torque Nm (kgfcm) PU35P M16×70L 6 pcs. 235.2±35.2 (2400±360) Pressure drop characteristics (viscosity 36 mm 2 /s (cSt)) 0.8 Pressure drop amount (MPa) 0.6 0.4 0.2 0 100 200 300 400 500 600 Flow rate (L/min) 2-38
- Page 74 and 75: Check valve (1) ●C (cartridge typ
- Page 76 and 77: Amount of pressure drop (MPa Check
- Page 78 and 79: 45° Check valve (2) ●C (flange c
- Page 80 and 81: Pilot operated check valve (1) Sub-
- Page 82 and 83: A Y B X Pilot operated check valve
- Page 84 and 85: Pilot operated check valve (2) Flan
- Page 86 and 87: Pressure gauge valve Pressure gauge
- Page 88 and 89: Page Relief valve - Direct operated
- Page 90 and 91: Hydraulic symbols Pressure increase
- Page 92 and 93: Pressure override characteristics (
- Page 94 and 95: Dimension drawing RD*G/R RDV6G/R L2
- Page 96 and 97: RDV1M6R A 62 Maximum of 152 61 14.5
- Page 98 and 99: Type indication RBE Relief valve -
- Page 100 and 101: Pilot valve The type indication of
- Page 102 and 103: Dimension drawing RB*P B1 B2 X P T
- Page 104 and 105: Relief valve - Balanced piston type
- Page 106 and 107: Type indication RB35X Pilot relief
- Page 108 and 109: RB35F 38 19 110 Y port G1/4 screw d
- Page 110 and 111: Type indication RB52 Relief valve-
- Page 112 and 113: Pilot valve The type indication of
- Page 114 and 115: Three stage pressure relief valve 3
- Page 116 and 117: Dimension drawing 3RBE L10 L1 L8 L3
- Page 118 and 119: Pressure override characteristics (
- Page 120 and 121: PUE Pilot operated unloading relief
- Page 122 and 123: Dimension drawing PU10 47.1 85 66.7
- Page 126 and 127: Dimension drawing PU35P (Gasket con
- Page 128 and 129: Specifications SD6P SD10P P-DE6R14-
- Page 130 and 131: Sequence valve — Balanced piston
- Page 132 and 133: Minimum adjustment pressure charac
- Page 134 and 135: Dimension drawing SB L5 L3 L2 6 13
- Page 136 and 137: Pressure override characteristics (
- Page 138 and 139: Pressure reducing valve - Balanced
- Page 140 and 141: Secondary side minimum adjustment p
- Page 142 and 143: The direct operated type relief val
- Page 144 and 145: ●B*G/GT*・3 ●Handle adjusting
- Page 146 and 147: ●B*P*・1 ●Handle adjusting typ
- Page 148 and 149: Counterbalance valve CBD Overview
- Page 150 and 151: Dimension drawing CBD*G/R Handle ad
- Page 152 and 153: Pressure drop characteristics (visc
- Page 154 and 155: Variable throttle valve T1M 3-2 Th
- Page 156 and 157: ■Dimension drawing ●T1M*P C (wh
- Page 158 and 159: ■Pressure - Flow rate characteris
- Page 160 and 161: ■Dimension drawing ●T1M*P L1 L2
- Page 162 and 163: ■Pressure - Flow rate characteris
- Page 164 and 165: ■Pressure drop characteristics (v
- Page 166 and 167: 3-13 ■Dimension drawing ●TC1M*P
- Page 168 and 169: Pressure - Flow rate characteristic
- Page 170 and 171: ■Pressure drop characteristics (v
- Page 172 and 173: Pressure - Flow rate characteristic
Hydraulic symbols<br />
P<br />
X<br />
T<br />
Specifications<br />
Nominal dimension<br />
Maximum working pressure MPa (kgf/cm 2 )<br />
35<br />
30.9 (315)<br />
Maximum flow rate L/min<br />
600<br />
Pressure ratio between cut-in and cut-out (%)<br />
82 (Note)<br />
Mass kg<br />
Gasket connection type<br />
17<br />
Flange connection type<br />
(Note) Although the design value is 82%, the pressure ratio may change to approximately 78 – 86%<br />
depending on the set pressure or flow rate.<br />
Pilot operated unloading relief valve (2)<br />
Pressure increase value per turn<br />
(clockwise) of adjust thread MPa (kgf/cm 2 )<br />
Nominal<br />
Highest dimension<br />
adjustment pressure<br />
80<br />
160<br />
315<br />
7.35 (75.0)<br />
(Note) As the above value is a calculated value, there<br />
are slight variations in the product.<br />
Flange<br />
Valve type<br />
35<br />
1.96 (20.0)<br />
3.53 (36.0)<br />
20.6MPa<br />
TFAA-40<br />
PU35F<br />
30.9MPa<br />
TFXA-40<br />
When you use a flange, please place an order for the above flange type.<br />
For the dimension drawing, refer to page 16 of the appendix.<br />
Accessories<br />
Maximum working pressure<br />
Precautions in use<br />
If piping from the check valve to the<br />
accumulator (ACC) is thin and long, the<br />
difference between the cut-out pressure and<br />
cut-in pressure becomes small, causing the<br />
operation to be unstable. Install piping so<br />
that the pressure drop amount (ΔP) from<br />
the check valve to ACC is [(cut-out pressure<br />
– cut-in pressure) x 1/3].<br />
Flange type<br />
Connection<br />
diameter<br />
2B<br />
2B<br />
Mass<br />
2.6kg<br />
2.7kg<br />
Mounting bolt<br />
Type<br />
Hexagon socket<br />
head cap thread<br />
Quantity Tightening torque Nm (kgfcm)<br />
PU35P M16×70L 6 pcs.<br />
235.2±35.2 (2400±360)<br />
Pressure drop characteristics (viscosity 36 mm 2 /s (cSt))<br />
0.8<br />
Pressure drop amount (MPa)<br />
0.6<br />
0.4<br />
0.2<br />
0 <strong>10</strong>0 200 300 400 500 600<br />
Flow rate (L/min)<br />
2-38