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EX450 Hydraulic Main Control Valve Assy for Hitachi Excavator Spare Parts 4434686 4632973 Main Control Valve
EX450 Hydraulic Main Control Valve Assy for Hitachi Excavator Spare Parts 4434686 4632973 Main Control Valve
Product Overview
The control valve (also known as the main control valve or multi-valve block) is the central hydraulic control component in excavators. It consists of multiple parallel spools that precisely distribute high-pressure oil from the pump to actuators (e.g., hydraulic cylinders, motors) based on operational demands, enabling coordinated machine movements.
Specifications
Category
Excavator Hydraulic Parts
Model
EX450
Part Number
4434686 4632973
Package
Wooden Box
Application
Excavator
Product Attributes
Excavator Parts
Working Principle
Flow Distribution: Operator joystick or electronic signals shift valve spools, adjusting port openings to control oil flow rate and direction to each actuator.
Pressure Regulation: Integrated pressure compensators and overload relief valves maintain stable flow under varying loads while preventing pressure spikes.
Multi-circuit Coordination: Parallel spool design allows simultaneous operation of multiple actuators (e.g., boom lifting + arm retraction), with the system automatically splitting pump flow.
Product Images
#
Part No.
Description
Qty
4434686
VALVE; CONTROL (1/5)
1
1
----
. HOUSING
1
2
0818001
. PLUNGER
1
3
0818002
. PLUNGER
1
4
0818003
. PLUNGER
1
5
0818004
. PLUNGER
1
6
0622843
. VALVE
1
7
0622817
. CAP
1
8
0810405
. SPRING
1
9
4088425
. O-RING
4
10
0189803
. CHIP
2
11
0622816
. SPACER
1
12
0810406
. SPOOL
1
15
4469304
. VALVE; RELIEF
1
17
0622829
. CHECK
2
18
0622827
. SPRING
2
19
0622825
. CAP
1
20
0223104
. RING; BACK-UP
1
28
4506420
. O-RING
1
29
4027959
. RING; BACK-UP
6
30
0646203
. PLUG
1
31
0624703
. O-RING
1
32
0624702
. CAP
1
33
0622803
. COVER
3
34
0101616
. O-RING
8
35
0622805
. SLEEVE
4
36
0622806
. GUIDE
8
37
0622807
. SPIRNG
4
38
0622808
. CAP
4
39
0809705
. COVER
1
41
0622810
. CAP
1
42
957366
. O-RING
2
43
M341230
. BOLT; SOCKET
16
44
0622875
. PLUG
1
45
0818005
. COVER
1
46
0622877
. CAP
1
47
0166805
. RING; BACK-UP
1
48
4506412
. O-RING
1
66
4153108
. O-RING
5
68
0212416
. O-RING
1
72
4153098
. O-RING
1
73
4506418
. O-RING
1
74
0622871
. SEAT
1
75
0810407
. CAP
1
76
0622873
. BALL
1
77
4113187
. RING; BACK-UP
1
78
966689
. O-RING
1
105
0809734
. POPPET
1
106
0809735
. RING; BACK-UP
2
107
0809736
. O-RING
1
108
0809737
. SPRING
1
109
0809738
. SLEEVE
1
110
0809739
. O-RING
1
111
0212312
. RING; BACK-UP
1
112
0809740
. CAP
1
113
4153099
. O-RING
5
114
0809708
. SLEEVE
1
115
0809709
. NUT
1
116
0809710
. PISTON
1
117
0809711
. O-RING
1
118
0809712
. SEAT
1
119
0809713
. SPRING
1
120
0809714
. POPPET
1
121
0809715
. SLEEVE
1
122
0809716
. SCREW
1
123
0809717
. NUT
1
124
0809718
. CAP
1
125
0135206
. SPRING
1
126
0809719
. POPPET
1
127
4040813
. RING; BACK-UP
1
128
0809720
. O-RING
1
129
0809729
. PISTON
4
130
0809728
. POPPET
4
131
0809727
. SPRING
4
132
0809726
. O-RING
4
133
0809725
. RING; BACK-UP
8
134
0809724
. SPRING
4
135
0809723
. SLEEVE
4
136
0809722
. SEAT
4
137
0809721
. NUT
4
138
0809733
. POPPET
4
139
0809732
. SPRING
4
140
0809731
. O-RING
4
141
4153089
. O-RING
4
142
0809730
. SCREW
4
250
4469298
. VALVE; RELIEF
4
Our Advantages
Strong Part Number Database: If you can provide the right model and part number, we can supply the right product.
Professional and Experienced Salesperson: Our founder has been in this field for more than 7 years, with rich experiences.
Strict and Complete Company Rules: We will try our best to meet customer's delivery time. Before delivery, we must verify the part number or pictures of products one by one, to ensure customers receive high-quality and right-quantity goods.
Good Management System: No matter how big or small the order, as long as customers place the order, we will provide exporting service free of charge.
Good Service Attitude: If the customer has any questions about the product, we will help solve the problem immediately. As long as customers' requirements are reasonable, we will endeavor to make them satisfied.
Company Details
Bronze Gleitlager
,
Bronze Sleeve Bushings
and
Graphite Plugged Bushings
from Quality China Factory
Year Established:
2013
Total Annual:
20000-3000000
Employee Number:
50~93
Ecer Certification:
Verified Supplier
GZ Yuexiang Engineering Machinery Co., Ltd.
GZ Yuexiang Engineering Machinery Co., Ltd, is a foreign trade company integrating development, sales, procurement, warehousing, transportation and service. Founded in September 2013, we have more than twelve years of experience in machinery t... GZ Yuexiang Engineering Machinery Co., Ltd.
GZ Yuexiang Engineering Machinery Co., Ltd, is a foreign trade company integrating development, sales, procurement, warehousing, transportation and service. Founded in September 2013, we have more than twelve years of experience in machinery t...