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Pressure relief, holding pressure valve

Model: 500X
Nominal diameter: DN50 ~ 1000mm
Nominal pressure: PN1.0 ~ 2.5MPa
Suitable medium: water, oil, water, sewage
Temperature: 0 ~ 80 ℃
Flange Standard: GB / T17241.6, GB / T9113
Test standards: GB / T13927, API598

First, 500X relief valve structure and use of features:

500X pressure relief / pressure holding valve consists of a main valve, pressure relief / pressure pilot valve needle, ball valve, microfilter and pressure gauge to form a hydraulic control takeover system. The use of hydraulic automatic operation, that can be used for pressure relief valve can also be used as holding pressure valve. For pressure relief valve used to maintain the water supply pressure below the set safety value; do holding pressure valve can maintain the main valve upstream of the water pressure above the set value, maintaining the water supply pressure upstream of the main valve.
500X pressure relief valve using hydraulic self-control, do not need other devices and energy, easy maintenance, a valve and more. This series of valve products are widely used in high-rise buildings, living areas and other water supply pipe network systems and urban water supply projects.

Second, 500X pressure relief valve works:

1, as the pressure relief valve: When the pressure relief valve / pressure regulator to adjust the state, the water through the needle valve, the main valve control room, ball valve A, pressure relief / holding pressure pilot valve, ball valve B to export, this time Main valve is open. When the inlet pressure exceeds the safety value set by the pressure relief / pressure holding pilot valve, the pressure relief pilot valve will open automatically and release part of the water through the valve C to relieve the pressure in the pipeline. The pressure relief valve closes automatically when the pressure returns to its safe value. For pressure relief valve, the ball valve normally open.
2, as holding pressure valve: When the pressure relief valve / pilot pressure regulator to adjust the state, as long as the main valve inlet pressure below the pilot valve set, pilot valve is closed. The main control room pressure, the main valve is closed. When the pressure on the upstream of the main valve exceeds the set pressure of the pilot valve, the pilot valve can only be opened. The water in the control room is discharged to the outlet via the ball valve. The main valve of the control room is opened and the water supply is started, that is, the upstream hydraulic pressure is maintained. For holding pressure valve, ball valve C is normally closed or replaced with silk plug.

Third, 500X pressure relief valve main technical parameters:

Nominal pressure (Mpa)	Shell test pressure (MPa)	Seal test pressure (MPa)	Suitable media	Medium temperature (℃)
1.0	1.5	1.1	water	0-80
1.6	2.4	1.76
2.5	3.75	2.75

Fourth, 500X pressure relief valve main parts and materials:

Part Name	Parts and materials
Body valve cover	WCB
Valve seat disc	Copper alloy
O-ring seals	Nitrile rubber
Valve stem	2Cr13
spring	50CrVA
Needle valve	Copper alloy
Ball valve	Copper alloy
Pressure relief / holding pressure pilot valve	Copper alloy
Micro filter	stainless steel

Fifth, 500X pressure relief valve connection size (PN 1.0-2.5MPa):

Nominal diameter DN	L	H	H1	A	B
50	250	335	90	170	170
65	280	345	98	180	180
80	310	355	110	190	190
100	350	365	120	200	200
125	400	445	145	215	215
150	450	460	155	230	230
200	550	505	190	255	255
250	650	550	250	295	295
300	800	710	290	325	325
350	900	725	330	380	380
400	1000	760	360	415	415
450	1000	810	445	435	435
500	1100	865	495	460	460
600	1100	935	550	520	520
700	1450	1000	605	570	570
800	1560	1100	730	620	620
900	1800	1205	800	670	670
1000	2000	1330	910	830	830

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