Z2S16 | Data Sheet - Operation Manual 1/4 WK 450 310 | 12.2021
Double check valve pilot-operated,
sandwich type Z2S16
NS 16 | p
max
35 MPa | Q
max
200 dm
3
/min | WK 450 310
TECHNICAL PARAMETERS
APPLICATION
Double check valve, pilot operated, sandwich type Z2S16…. is used for


The valve is usually used for:
· unloading the valve that is under pressure
· preventing load drop in the event of a circuit break



DATA SHEET - OPERATION MANUAL
DESCRIPTION OF OPERATION
Z2S16… 
12 and 3
and 5A1 to A or B1 to B
A to A1 or B to B1A1 to
A, the piston 65 from its
seat, and then the main poppet 3B to B1
B1 to B

A1 or B1 causes

A1 and B1
hydraulic fluid mineral oil
 
nominal fluid viscosity 37 mm

 °C
viscosity range 

/s
 
ambient temperature range 
max. working pressure 
cracking pressure 
area ratio (valve surface / piston
surface)
4 : 1
area ratio (ball seat surface / piston
surface)
1 : 4
weight 
assembly and operation requirements at: www.operating-conditions.ponar.pl
Z2S16 -11
T
P
A
B
X
Y
L
T1
P1
A1
B1 X1
Y1
L1
side of the element
closing the stack
subplate side
2
4
5
3
1
6
EXAMPLE OF APPLICATION
A
B
M
Z2S16...
Z2S16 | Data Sheet - Operation Manual  WK 450 310 | 12.2021
OVERALL AND CONNECTION DIMENSIONS
version Z2S16...
A
BPT
X
L
Y
A1
B1
P1
T1
X1
L1
Y1
subplate side
s
id
e o
f
th
e e
l
emen
t
c
l
os
i
ng
th
e s
t
ac
k
A
B
subplate side
si
d
e of the element closing the stack
A
B
subplate side
side of the element closing the stack
A
B
subplate side
side of the element closing the stack
A
BPT
X
L
Y
A1
B1
P1
T1
X1
L1
Y1
subplate side
side
of
the
element
closing
the
stack
A
B
P
T
XL
Y
A1
B1
P1
T1
X1
L1
Y1
subplate side
s
id
e o
f
th
e e
l
emen
t
c
l
os
i
ng
th
e s
t
ac
k
version Z2S16…
version Z2S16 A…
version Z2S16 B…
0,6
0,7
0,5
0,4
0,3
0,2
0,1
0
200
100
50
Q (dm /min)
Δ
p (M Pa)
A1 A
B1 B
→
→
A A1
B B1
→
→
3
Δ
p
[
MPa
]
Q
[
dm /min
]
A1
→
A
;
B1
→
B
A
→
A1
;
B
→
B1
0
50
100
3
150
200
0,1
0,2
0,3
0,4
0,5
0,6
0,7
A1
→
A; B
1
→
B;
A
→
A1; B
→
B1;
Δ
p
[MPa]
A
BPT
X
L
Y
A1
B1
P1
T1
X1
L1
Y1
subplate side
s
id
e o
f
th
e e
l
emen
t
c
l
os
i
ng
th
e s
t
ac
k
A
B
subplate side
si
d
e of the element closing the stack
A
B
subplate side
side of the element closing the stack
A
B
subplate side
side of the element closing the stack
A
BPT
X
L
Y
A1
B1
P1
T1
X1
L1
Y1
subplate side
side
of
the
element
closing
the
stack
A
B
P
T
XL
Y
A1
B1
P1
T1
X1
L1
Y1
subplate side
s
id
e o
f
th
e e
l
emen
t
c
l
os
i
ng
th
e s
t
ac
k
version Z2S16…
version Z2S16 A…
version Z2S16 B…
0,6
0,7
0,5
0,4
0,3
0,2
0,1
0
200
150
100
50
Q (dm /min)
Δ
p (M Pa)
A1 A
B1 B
→
→
A A1
B B1
→
→
3
Δ
p
[
MPa
]
Q
[
dm /min
]
A1
→
A
;
B1
→
B
A
→
A1
;
B
→
B1
0
50
100
3
150
200
0,1
0,2
0,3
0,4
0,5
0,6
0,7
A1
→
A; B
1
→
B;
A
→
A1; B
→
B1;
Δ
p
[MPa]
A
BPT
X
L
Y
A1
B1
P1
T1
X1
L1
Y1
subplate side
s
id
e o
f
th
e e
l
emen
t
c
l
os
i
ng
th
e s
t
ac
k
A
B
subplate side
si
d
e of the element closing the stack
A
B
subplate side
side of the element closing the stack
A
B
subplate side
side of the element closing the stack
A
BPT
X
L
Y
A1
B1
P1
T1
X1
L1
Y1
subplate side
side
of
the
element
closing
the
stack
A
B
P
T
XL
Y
A1
B1
P1
T1
X1
L1
Y1
subplate side
s
id
e o
f
th
e e
l
emen
t
c
l
os
i
ng
th
e s
t
ac
k
version Z2S16…
version Z2S16 A…
version Z2S16 B…
0,6
0,7
0,5
0,4
0,3
0,2
0,1
0
200150100
50
Q (dm /min)
Δ
p (M Pa)
A1 A
B1 B
→
→
A A1
B B1
→
→
3
Δ
p
[
MPa
]
Q
[
dm /min
]
A1
→
A
;
B1
→
B
A
→
A1
;
B
→
B1
0
50
100
3
150
200
0,1
0,2
0,3
0,4
0,5
0,6
0,7
A1
→
A; B
1
→
B;
A
→
A1; B
→
B1;
Δ
p
[MPa]
A
BPT
X
L
Y
A1
B1
P1
T1
X1
L1
Y1
subplate side
s
id
e o
f
th
e e
l
emen
t
c
l
os
i
ng
th
e s
t
ac
k
A
B
subplate side
si
d
e of the element closing the stack
A
B
subplate side
side of the element closing the stack
A
B
subplate side
side of the element closing the stack
A
BPT
X
L
Y
A1
B1
P1
T1
X1
L1
Y1
subplate side
side
of
the
element
closing
the
stack
A
B
P
T
XL
Y
A1
B1
P1
T1
X1
L1
Y1
subplate side
s
id
e o
f
th
e e
l
emen
t
c
l
os
i
ng
th
e s
t
ac
k
version Z2S16…
version Z2S16 A…
version Z2S16 B…
0,6
0,7
0,5
0,4
0,3
0,2
0,1
0
200
150
100
50
Q (dm /min)
Δ
p (M Pa)
A1 A
B1 B
→
→
A A1
B B1
→
→
3
Δ
p
[
MPa
]
Q
[
dm /min
]
A1
→
A
;
B1
→
B
A
→
A1
;
B
→
B1
0
50
100
3
150
200
0,1
0,2
0,3
0,4
0,5
0,6
0,7
A1
→
A; B
1
→
B;
A
→
A1; B
→
B1;
Δ
p
[MPa]
version Z2S16A... version Z2S16B...

detailed symbols
PERFORMANCE CURVES
ν = 41 mm

ow resistance curves
A
BPT
X
L
Y
A1
B1
P1
T1
X1
L1
Y1
subplate side
s
id
e o
f
th
e e
l
emen
t
c
l
os
i
ng
th
e s
t
ac
k
A
B
subplate side
si
d
e of the element closing the stack
A
B
subplate side
side of the element closing the stack
A
B
subplate side
side of the element closing the stack
A
BPT
X
L
Y
A1
B1
P1
T1
X1
L1
Y1
subplate side
side
of
the
element
closing
the
stack
A
B
P
T
XL
Y
A1
B1
P1
T1
X1
L1
Y1
subplate side
s
id
e o
f
th
e e
l
emen
t
c
l
os
i
ng
th
e s
t
ac
k
version Z2S16…
version Z2S16 A…
version Z2S16 B…
0,6
0,7
0,5
0,4
0,3
0,2
0,1
0
200
150
100
50
Q (dm /min)
Δ
p (M Pa)
A1 A
B1 B
→
→
A A1
B B1
→
→
3
Δ
p
[
MPa
]
Q
[
dm /min
]
A1
→
A;
B1
→
B
A
→
A1;
B
→
B1
0
50
100
3
150
200
0,1
0,2
0,3
0,4
0,5
0,6
0,7
A1
→
A; B
1
→
B;
A
→
A1; B
→
B1;
Δ
p
[MPa]
Z2S16 | Data Sheet - Operation Manual 3/4 WK 450 310 | 12.2021
A
B
L
P
T
Y
X
7
34,1
18,3
65,9
76,6
101,6
14,3
54
55,6
69,9
12,7
88,1
1,6
71,5
6
Ø17,5 (max) - 4 holes (P, T, A, B)
M10 depth 17 - 4 holes
M6 depth 17 - 2 holes
Ø4 depth 8 - 2 holes
Ø4 - 3 holes (X, Y, L)
138 (min)
35
side of the element closing the stack
subplate side
A1
B1
L1
P1
T1
Y1
X1
2
3
O4 - 2 holes
O11 - 4 holes
10
27,5
69,9
101,6
50
O
3
3
4 5
55
55
80
20
19
178
90
2 pins
1
138
90 (min)
0,63
r
0,01/100
O6,6 - 2 holes
OVERALL AND CONNECTION DIMENSIONS
 
 
 holes for positioning pin
 22,3 × 2,4 – 4 pcs/set (P, T, A, B)
 10 × 2 – 3 pcs/set (X, Y, L)
 porting pattern of subplate compliant with
ISO 4401-08-07-0-94
(CETOP08)
 required surface quality of the valve contact
surface
×
Z2S16 | Data Sheet - Operation Manual 4/4 WK 450 310 | 12.2021
HOW TO ORDER
1 nominal size
NS16 = 16
2 design version
with two valves = ∅

with valve at B port = B
3 series number
series 11 = 11
connection and installation
dimensions unchanged
4 sealing
NBR (for uids based on mineral oils) = ∅

5 further requirements= *

SUBPLATE AND MOUNTING SCREWS

The symbols in bold 
Coding example: Z2S16-11
 WK450788:


M10 × L* – 10.9 - 4 pcs/set M6 × L* – 10.9 - 
PN–ENISO 4762delivered on separa-
te order
Tightening torque of the screws:
M10 × L* – M
d
= 62 Nm
M6 × L* – M
d
= 12,5 Nm


CONTACT





1
16
3
−
Z2S
4
*