Cast steel PV valve

High velocity PV Valve, Body Cast Steel, inner SUS

China Cast Steel PV Valve drawing
China Cast Steel PV Valve drawing

Marine PV valve (pressure/vacuum valve for cargo oil tank) is also called as high-velocity relief valve, high velocity P/V valve, generally used in the relief system of the oil tanker and chemical tanker, according to the current regulations IMO and IBC. The purpose of the high velocity valve is to provide automatic control of pressure differentials during liquid cargo ship loading, voyage, ballasting and de-ballasting without any manual operation, also, it provides auto-protection against fire and explosions on deck. Additionally in the event that the inert gas system can not supply gas promptly, the vacuum valve can auto open to protect the tank against excessive vacuum when de-ballasting on dock. Normal, when the pressure risen in tank because of temperature or loading, the pressure valve open automatically and vent gas. When the pressure of tank come to pressure differentials, the vacuum valve or pressure valve all can be automatic resetted. If an ignition occurs outside the tank space, the flames will be quenched in the flame trap.

High velocity PV Valve Specification:

  • Material: Cast Steel 20#, Inner SUS
  • Flange Standard: GB, JIS, DIN, ANSI, BS
  • Opening Pressure of Vacuum Valve: -3.5kPa
  • Opening Pressure of Pressure Valve on the oil tank is 14kPa, on the chemical tank is 20kPa.
  • The opening pressure of the pressure may be different, but the differences of opening pressure and flow range is inapparent if the pressure valves have the same diameter.

Main Parts & Material:

Serial No.PartsQuantityMaterialRemarks
1P-valve base1ZG200-400Cast 20#
2Water nozzle10Cr18Ni9SUS304
3P-valve seat10Cr18Ni9SUS304
4P-valve disc10Cr18Ni9SUS304
5Matching block10Cr18Ni9SUS304
6P-valve body (A) (B)1ZG200-400Cast 20#
7Conducting machine10Cr18Ni9SUS304
9V-valve body1ZG200-400Cast 20#
10Matching block10Cr18Ni9SUS304
11V-valve disc10Cr18Ni9SUS304
12V-valve seat10Cr18Ni9SUS304
13Flame screen200Cr17Ni14Mo2SUS304
14Flame screen gland1ZG200-400Cast 20#
16Climbing pole10Cr18Ni9SUS304
17Gas-freeing cover or V-valve cover1ZG200-400Cast 20#

Main Size List(mm):

DND2D1DLHAssembly hole
  • The flange size in the list as per GB2501. We also can machine the flange as per JIS, DIN, ANSI.

The description/sizes may be different with goods, please check with us when order.

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