LHF / LJF

Q'ty :

Description

Hydraulic Prefill Valve

LHF & LJF Sandwich type, two different materials.

━Symbol

━DESCRIPTION

The working principal of prefill valve is like pilot-to-open check valve. It allows free flow from the port 2 to port 1 and blocks flow in the opposite direction. Pressure at pilot port (port 3) will open the valve from port 1 to port 2.

In case any shock, noise and system damage, please make sure it has already completely decompression at port 1 then pilot to open the prefill valve allowing flow from port 1 to port 2. When pilot port is blocked, prefill valve acts like a large

capacity check valve. LINS hydraulics provides two types and two materials prefill valve, including sandwich and flange mounting type, alloy steel (SCM440) and cast iron (FCD50).

It can be directly fitted on the cylinder cap end or mounting on piping flange in the hydraulic systems. The operating pressure up to 400 bar (5800 PSI), capacity up to 15000 LPM (4000 GPM).

━FEATURE

l Compact size & easy installation.

l High pressure, high durability.

l High capacity and low-pressure loss.

l Sandwich and flange mounting type.

l Two materials, alloy steel and cast iron.

l Directly mount on cylinder cap end.

█ ORDER CODE

LHF	-	100
①		②

①: Series

LHF: Sandwich type, SCM440 material.

LJF: Sandwich type, FCD50 material.

②: Valve size

32 – 250

(See dimension table for reference)

█ LHF / LJF DIMENSIONAL DRAWING

Notice:

1. Attention for poppet working space c1.

2. LINS offer the suction side flange with LYF and LAF prefill valve. For LHF and LJF series, flange must order separately.

3. All LINS prefill valves including a pilot port adapter with orifice plug, see table for orifice and plug size.

█ LHF / LJF Dimension Table (mm)

p	S	Q	Model		øa1	øa2	øa3	øa4	b1	b2	c1	c2	ød1	d2
1/4" PT	-	AS228	LHF32	LJF32	34	49	-	82	28	70	7.5	15	33	62
1/4" PT	M4 x 30	AS231	LHF40		42	56.5	91	108	28	76.5	10	16.5	39	62
1/4" PT	M4 x 30	AS236	LHF50	LJF50	53	72	112	128	29	91	12.5	16	42	62
1/4" PT	M5 x 35	P95	LHF63	LJF63	63	87	125	143	33.5	105	16	18.5	50	62
1/4" PT	M5 x 40	P120	LHF80	LJF80	78	108	150	169	38.5	117	17	24	57	62
1/4" PT	M6 x 45	P145	LHF100	LJF100	97	130	185	210	44	150	22	29	70	62
3/8" PT	M6 x 50	P185	LHF125	LJF125	128	170	226	248	51	190	32	35	89	70
3/8" PT	M8 x 70	P235	LHF160		160	220	284	310	70	225	37	50	120	70
1/2" PT	M10 x 95	P295	LHF200		200	272	355	390	95	286	50	65	145	85
1/2" PT	M12 x 115	P385	LHF250		250	350	445	490	110	372	70	70	177	85

█ LHF / LJF Specification

Model		Max. Pressure	Max. Flow	Piping port	Pilot ratio	Gross Weight
Model		(Bar)	(LPM)			(Kg)
LHF32	LJF32	400 / 250	160	2B	3.6	1.3 /1.2
LHF40		400	250	2.5B	3.6	2.2
LHF50	LJF50	400 / 250	400	3B	4.5	3.2 / 3.0
LHF63	LJF63	400 / 250	630	3.5B	4.4	4.5 / 4.2
LHF80	LJF80	400 / 250	1000	4B	4.6	6.8 / 6.4
LHF100	LJF100	400 / 250	1600	5B	4.6	12.3 / 11.7
LHF125	LJF125	400 / 250	2500	8B	4.5	20.5 / 19.3
LHF160		400	4000	10B	4.3	45
LHF200		280	7000	12B	4.3	98
LHF250		280	15000	16B	4.5	178

█ Pilot Port Adapter Schematic & Dimension Table

Model	orifice plug	orifice size (mm)
LHF LJF LYF LAF-32 40 50	1/8" PT	0.7
LHF LJF LYF LAF-63		0.8
LHF LJF LYF LAF-80		1.0
LHF LJF LYF LAF-100		1.2
LHF LJF LYF LAF-125 160	1/4" PT	1.5
LHF LJF LYF LAF-200 250	none	none

█ LHF / LJF Flange Dimension (mm), Size 32-100

Piping port	s	g	f	d1	d2	Flange Model	øa1	øa2	øa3	øb1	øb2	øc1	øc2	øc3
2B	4-ø17.5	-	-	20	-	FHP-32-A	48	-	82	35	-	61.1	103.2	135
				-	20	FLT-32-A				-	35
2.5B	4-ø22	2-M4	10	22	-	FHP-40-A	57	91	107	44	-	77.1	130.1	165
				-	22	FLT-40-A				-	44
3B	6-ø18	2-M4	10	20	-	FHP-50-A	73	112	125	40	-	90	146	180
				-	20	FLT-50-A				-	40
	6-ø26			25	-	FHP-50-B				50	-		154	198
				-	25	FLT-50-B				-	45
3.5B	8-ø18	2-M5	10	20	-	FHP-63-A	88	125	140	42	-	102	161	198
				-	12	FLT-63-A				-	35
	8-ø26			27	-	FHP-63-B				55	-		169	214
				-	27	FLT-63-B				-	50
4B	8-ø18	2-M5	10	20	-	FHP-80-A	108.5	150	166	45	-	115	187	220
				-	15	FLT-80-A				-	35
	8-ø26			27	-	FHP-80-B				65	-		195	240
				-	27	FLT-80-B				-	55
5B	8-ø23	2-M6	10	25	-	FHP-100-A	132	185	210	65	-	141	236	280
				-	20	FLT-100-A				-	55
	8-ø33			30	-	FHP-100-B				80	-		244	300
				-	30	FLT-100-B				-	70

█ LHF / LJF Flange Dimension (mm), Size 125-250

Piping port	s	g	f	d1	d2	Flange Model	øa1	øa2	øa3	øb1	øb2	øc1	øc2	øc3
8B	12-ø26	2-M6	15	35	-	FHP-125-A	168	226	249	70	-	219	300	350
				-	25	FLT-125-A				-	60
	12-ø32			50	-	FHP-125-B				90	-			354
				-	30	FLT-125-B				-	80
10B	16-ø32	2-M8	15	40	-	FHP-160-A	218	284	312	90	-	270	367	422
				-	30	FLT-160-A				-	80
12B	20-ø32	2-M10	20	40	-	FHP-200-B	270	355	392	100	-	321	442	510
				-	35	FLT-200-B				-	90
16B	24-ø32	2-M12	25	55	-	FHP-250-A	350	445	495	110	-	409	555	632
				-	40	FLT-250-A				-	100
18B	22-ø45			55	-	FHP-250-B				125	-	460
				-	40	FLT-250-B				-	110

█ LHF / LJF Flange order code

FHP	-	100	-	A
①		②		③

①: Series

FHP: High pressure side flange.

FLP: Suction side flange.

②: Flange size, see flange dimension table for reference.

③: Flange thickness

A: Standard thickness

B: Thickened thickness

*The provided flange dimension is for LHF and LJF series, please order separately. For LYF & LAF series, we offer a suction side flange kit with the prefill valve.

█ LHF / LJF Assembly Schematic

█ Application Circuit

Example of prefill valve circuit on a pressing motion.

Main Cylinder	Sol.1	Sol.2	Sol.3	Sol.4	Prefill Valve
rod descending	v		v		suction mode
chamber pressurized	v		v		closed
pressure retaining					closed
rod ascending		v		v	pilot open

Consideration:

1. Make sure the pressure at main cylinder cap side has completely decompression when cylinder is retracted.

2. It can connect a needle valve with decompression solenoid valve (sol.4) to control the decompression time.

LHF / LJF

Hydraulic Prefill Valve

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