300 SERIES CHECK VALVES
www.d-lok.com
How to Order
NCVA MD 4N 4T 1/3 ST S
Series Designator End Connection Size Designator Nominal Cracking O-Ring Material Body Material
by Orifice Size Designator Pressure Designator Designator Designator
- Inlet/Outlet - 1/3:1/3 psi - ST: Viton(Standard) - S: SS316
CHECK
- NCVA: 4.8mm Orifice - D: Both Ends
- NCVB: 7.1mm Orifice D-LOK lube Fitting - 1:1 psi - BU: Buna N - B: Brass
- NCVC: 10.0mm Orifice - M: Both Ends
- 3:3 psi - KZ: Kalrez
- NCVD: 13.3mm Orifice Male Pipe Thread
- NCVE: 16.0mm Orifice - F: Both Ends - 10:10 psi - NP: Neoprene
- NCVF: 18.5mm Orifice Female Pipe Thread - 25:25 psi - EP: Ethylene Propylene
- MD: Male Pipe Thread - 100:100 psi - PE: PTFE
VALVES
and D-LOK Tube
Fitting Thread(In.) 1/8 1/7 3/8 1/2 3/4 1
- MF: Male Pipe Thread NFT(ISO/BSP)
and Female Pipe Designator 2N(R) 4N(R) 6N(R) 8N(R) 12N(R) 16N(R)
Thread
Fractional O.D.(In.) 1/8 1/4 3/8 1/2 3/4 1
Tube Designator 2T 4T 6T 8T 12T 16T
Tube
300 SERIES
Metric Q.D.(mm) 3 6 8 10 12 25
Cracking and Reseal Pressure
Tube Designator 3M 6M 8M 10M 12M 25M
60
Nominal Cracking Pressure, pslg
Nominal Minimum Maximum Reseal Pressure E
Cracking Pressure Cracking Pressure Cracking Pressure NG
E
NG
50 RA
RA
Psi bar psi bar psi bar psi bar RE Fixed cracking pressure
RE
SU
SU
ES For working pressure up to 3000 psig (206 bar)
40
ES
Up to 6
1/3 0.02 0 0 3 021 0.41 PR
PR
downstream pressure
NG
KI
AL
Up to 5 30 C
SE
1 0.07 0 0 4 0.28 0.34 A
downstream pressure 25
CR
RE
Up to 4
3 0.21 2 0.14 7 0.48 downstream pressure 0.28 20
30
3 or more
10 0.69 7 0.48 15 1.03 upstream pressure 0.21
10 20
17 or more
25 1.72 20 1.38 30 2.07 1.17 17
upstream pressure 0
100 6.90 80 5.51 110 7.58 70 or more 4.82 20 10 0 10 20 30 40 50 60 70
upstream pressure
Back
Example: From the graph, the actual cracking pressure of nominal cracking Pressure Actual Pressure, pslg@70°F (21°C)
pressure 25 psi is shown to range between 20 psi to 30 psi, and the reseal
pressure 17 psi to 20 psi.
*Cracking pressure is defined as the upstream pressure at which a detecta-
ble flow is measured. Factory Testing
*Reseal pressure is defined as the downstream pressure at which the check
valve closes bubble-tight. Every NATMAN 300 Series Check Valve is adjusted for factory
testing with nitrogen for cracking and reseal performance.
Technical Information Cleaning and Packaging
Series NCVA NCVB, NCVC, NCVE, NCVF
NCVD All valves are cleaned and packaged in accordance with D-LOK
standard cleaning and packaging procedures.
Maximum Working SS316 : 3000 psig (206 bar) SS316 : 2000 psig (137 bar)
Pressure @ 21°C (70°F) Brass : 3000 psig (206 bar) Brass: 1500 psig (103 bar)
Operating
Viton O-Rrg : -23°C ~ 191°C (-10°F ~ 375°F)
Buna N O-Rlng :-23°C ~ 121°C (-10°F ~ 250°F)
Kalrez O-Rhg : -23°C ~ 315°C (-10°F ~ 600°F)
Safety in Valve Selection
Temperature Range Neoprene O-Rng : -40°C ~ 121°C (-40°F ~ 250°F) Selections of valve function and rating, proper installation, ma-
Ethylene Propylene : -46°C ~ 149°C (-50°F ~ 300°F) terial compatibility, operation and maintenance of these valves
PTFE O-Rng : -46°C ~ 232°C (-50°F ~ 450°F) are the responsibility of the user.
1/3, 1, 3,10, 25,100 psi 1/3, 1, 3,10, 25 psi The system design, application must be taken into considera-
Nominal Cracking
(0.02, 0.07, 0.21, 0.69, 1.72, (0.02. 0.07, 0.21, 0.69, tion to ensure optimal performance and safety.
Pressure
6.90 bar) 1.72 bar)
We accept no liability for any improper selection, installation,
*PTFE seated valves require a minimum back pressure of 100 psi (6.90 bar) operation or maintenance.
to insure a leak-tight reseal.
D-LOK CORPORATION
www.d-lok.com
300 SERIES CHECK VALVES
Design Feature
• Fixed cracking pressure.
• Pressure rating up to 3000 psig.
• Temperature rating up to 375°F (190°C).
• Various end connection.
• Body materials available in SS316 and Brass.
• O-Ring provides leak-tight seal.
• Back stopped poppet minimizes spring overstress.
• Cracking pressures include 1/3, 1, 3, 10, 25, 100 psi
• 100% factory tested for cracking and reseating.
Meterials of construction Ordering Information and Table of Dimensions
End Connections Dimensions (mm)
Basic Ordering Orifice
Cv
Number (mm)
Intet Outlet H1 H2 L1 L2
D-2T- 1/8" D-Lok 1/8" D-Lok 11.11 55.60 0.16
25.00
M-2N- 1/8" Male NPT 1/8" Male NPT - 44.50
F-2N- 1/8" NPT 1/8" NPT - 46.50 -
D-4T- 1/4" D-Lok 1/4" D-Lok 14.29
NCVA 15.88 60.00 4.8
1 5 2 4 3 D-6M- 6mm D-Lok 6mm D-Lok 14.00 0.47
MD-4N4T- 1/4" Male NPT 1/4" Male NPT 14.29 56.40 25.00
Item Part Description Stainless Steel Brass M-4N- 1/4" Male NPT 1/4" Male NPT - 53.40
1 Body F-4N- 1/4" Female NPT 1/4" Female NPT - 54.60
2 Poppet SS316 Brass / B16 D-6T- 3/8" D-Lok 3/8" D-Lok 17.46
3 Connector 74.80
NCVB D-10M- 10mm D-Lok 10mm D-Lok 19.05 19.00 36.20 7.1 1.48
4 Spring SS302 SS302
M-6N- 3/8" Male NPT 3/8" Male NPT - 64.60
5 O-Ring Viton NBR
F-6N- 3/8" Female NPT 3/8" Female NPT - 63.80 -
* Silicon-based lubricant for Poppet.
D-8T- 1/2" D-Lok 1/2" D-Lok 22.22
* Molybdenum dry film lubricant for SS316 body threads.
NCVC 22.22 80.20 10.0 1.7
D-12M- 12mm D-Lok 12mm D-Lok 22.00 36.20
M-8N- 1/2" Male NPT 1/2" Male NPT - 74.40
F-8N- 1/2" Female NPT 1/2" Female NPT - 84.70 -
NCVD 28.58 13.5 2.6
D-10T- 5/8" D-Lok 5/8" D-Lok 25.40 91.80 48.10
D-12T- 3/4" D-Lok 3/4" D-Lok 28.58 110.70
67.00
NCVE M-12N- 3/4" Male NPT 3/4" Male NPT 31.75 - 106.30 16.0 5.2
F-12N- 3/4" Female NPT 3/4" Female NPT - 103.00 -
D-16T- 1" D-Lok 1" D-Lok 38.1 121.20
34.93
NCVF M-16N- 1" Male NPT 1" Male NPT - 116.20 68.40 18.0 8.0
F-16N- 1" Female NPT 1" Female NPT 41.28 - 111.40
*All dimensions shown are for reference purposes only, are subject to change.
