DQ Marine
ISO 9001-2008 Company | 7x24Hrs Service
Shipbuilding Equipment,Machienry and Consumables Supplies
DF-ISO Cast Steel High Velocity Pressure Vacuum Valve
PV Valves
FOB Price:
Get Latest Price Now
12 Months unless specified otherwise
Place of Origin:
Request a Quote Print this page
We can supply according to your requirement.
DF-ISO Cast Steel High Velocity Pressure Vacuum Valve:
China DF-ISO Cast Steel High Velocity Pressure Vacuum Valve:

High Velocity Pressure Vacuum Valve is called PV valve or P/V valve for short, generally used in the relief system of the oil tanker and chemical tanker, according to the current regulations IMO and IBC.

When the pressure in the tank reaches the set pressure of relief valve, the gas in the tank will be released with the speed of over 30m/s. The vacuum will beformed while the cargo oil tank is unloading, when the vacuum pressure reaches the set pressure of vacuum valve (normally it is -3.5Kpa), the vacuum valve will open automatically,then the air will go into the tank through the flame screen.

If the pressure is too high whil the ship is sailing, the high velocity PV valve will automatically release the pressure and keep the pressure balance.

Technical Specification:

1. Design Standard: ISO 15364-2007, MSC/circ. 677, GB/T19699-2012, MSC.1/circ. 1324, MSC/circ. 1009

2. Flange Standard: GB2506, JIS B2220, ANSI, DIN

3. Design Pressure:

Opening Pressure of Pressure valve: 14Kpa for Oil cargo tank, 20Kpa fo chemical cargo tank.

Opening pressure of Vacuum Valve: -3.5Kpa.


CCS, BV, ABS Type Approval Certificate and Product Certificate, NK product certificate

Main Parts and Material:

Serial No. Parts Quantity Material Remarks
1 P-valve base 1 ZG200-400 Cast 20#
2 Water nozzle 1 0Cr18Ni9 SUS304
3 P-valve seat 1 0Cr18Ni9 SUS304
4 P-valve disc 1 0Cr18Ni9 SUS304
5 Matching block 1 0Cr18Ni9 SUS304
6 P-valve body (A) (B) 1 ZG200-400 Cast 20#
7 Conducting machine 1 0Cr18Ni9 SUS304
8 Handle 1 0Cr18Ni9 SUS304
9 V-valve body 1 ZG200-400 Cast 20#
10 Matching block 1 0Cr18Ni9 SUS304
11 V-valve disc 1 0Cr18Ni9 SUS304
12 V-valve seat 1 0Cr18Ni9 SUS304
13 Flame screen 2 00Cr17Ni14Mo2 SUS304
14 Flame screen gland 1 ZG200-400 Cast 20#
15 Nameplate 1 0Cr18Ni9 SUS304
16 Climbing pole 1 0Cr18Ni9 SUS304
17 Gas-freeing cover or V-valve cover 1 ZG200-400 Cast 20#

Technical Parameters:

Type Desinged Opening Pressure(Kpa) Rated Working Pressure (Kpa) Hydraulic Test Press (Mpa) Velocity (m/s) Rated Flow Rate(m3/h)
Pressure Valve Vacuum Valve Pressure Valve Vacuum Valve Pressure Valve Vacuum Valve
DF50 14~20 -3.5 21 -7 0.345 ≥30 300 300
DF65 400 400
DF80 600 500
DF100 800 600
DF125 1000 800
DF150 2500 2200
DF200 3000 3000
DF250 3500 3000

Send us your inquiry now

we would revert with you within 24 hours.

We'll never share your email with anyone else.
Please send the specification, quantity, class certificate or other information.


Tel: 0086-23-68428422/68428422/68428422

Fax: 0086-23-68428422/68428422/68428422

Email: sales@dqmarine.com

  • Class Certificate of
  • dnvgl
  • bureauveritas
  • Lloyd's Register
  • eagle
  • css