High velocity PV Valve, Body Cast Steel, inner SUS

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.	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#

Main Size List(mm):

DN	D2	D1	D	L	H	Assembly hole
250	320	350	395	460	860	12xø22
200	268	295	340	455	850	8xø18
150	202	225	265	385	710	8xø18
125	178	200	240	380	665	8xø18
100	148	170	210	285	565	4xø18
80	128	150	190	285	535	4xø18
65	110	130	160	255	485	4xø14
50	90	110	140	255	485	4xø14