14
3) Deflation safety valve
A. Structure (see Figure 8)
17
16
15
14
13
12
11
10
9
6
5
4
3
2
1
7
8
13
14
15
16
12
11
10
17
J5AQF-13
GB3452.1-82
J5AQF-12
J5AQF-11
GB308-84
J5AQF-01
GB3452.1-82
GB893.1-86
O ring
Valve ball
spring
Valve spring
Valve core
O ring
Gasket
Rtainer ring
4
8
7
6
5
9
J5AQF-04
J5AQF-06
J5AQF-05
J5AQF-07
J5AQF-09
J5AQF-10
Guide rod
Valve casing
Lock nut
Adjusting screw nut
Windows
Spring seat
1
1
1
1
1
1
1
1
1
1
1
1
2
1
45
45
35
35
45
Organic glass
陶瓷
ceramic
65Mn
Oil resistant
rubber
40Cr
65Mn
35
65Mn
Quantity
Name
Material
1
1
1
40Cr
40Cr
40Cr
code name
numerical
order
J5AQF-02
J5AQF-03
2
3
Spherical pad
Valve core
1
J5AQF-01
Valve seat
Oil resistant
rubber
Figure 8 Structure of deflation safety valve
The valve body and valve seat in deflation safety valve are connected by threads. The bottom surface of the
valve seat cavity and the end face of the valve core need to be grinded to improve the sealing accuracy. The
safety valve core is equipped with an deflation safety valve core, which also needs to be grinded to obtain
reliable sealing. The top of the safety valve core is installed with an air valve spring. The safety valve core is
loaded with spring seat and valve spring, and the outlet passage of the valve core is equipped with non-return
valve ball SØ5 and adjusting screw. The valve body is equipped with adjusting nut and locking nut to adjust the
spring force. When the system pressure exceeds the spring compression force of the safety valve core, the safety
valve core is opened, the hydraulic oil spills back to the oil tank, and the system relieves pressure, which can
protect the pipeline system and the pump.
The designed deflation safety valve is installed on the top of liquid chamber to discharge the gas of hydraulic oil
in liquid chamber, then the liquid chamber can keep to be in pure liquid when driving the diaphragm. Thus it can
improve both volume efficiency of the pump and measurement accuracy. Meanwhile, it avoids self-discharge
function which appear when the discharge pipe is over pressure.
The valve structure is in smart design, simple structure, and combines safety valve and deflation valve into one
unit. It greatly simplifies the structure of hydraulic pressure
diaphragm metering pump, shrunk the volume,
reduces the production cost and improves the control performance of safety valve.
