The benefit of a EGP standard levelling valve, with a 2nd ride height control. Below is a complete technical description of the product

The 2nd ride height can be set in accordance with the respective angle (Deflection) of each valve. The angle here refers to the deflection of the control lever from the horizontal, in degrees. The body height changes (mm) as a function of the lever length; see chart “2nd ride height”.

Chart for 2nd ride height

Linkage distance (mm)	60	80	100	120	140	160	180	200	220	240	260	280	300	320
Height change (mm) for α = 10°	10	14	17	21	24	28	31	35	38	42	45	49	52	56
Height change (mm) for α = 16°	17	22	28	33	39	44	50	55	61	66	72	77	83	88
Height change (mm) for α = 20°	21	27	34	41	48	55	62	68	75	82	89	96	103	109
Height change (mm) for α = 35°	34	46	57	69	80	92	103	115	126	138	149	161	172	184

Example:

Using a levelling valve with 2nd ride height @16°, and lever length=220mm

Ride body height = 1210mm

2nd ride height = 1210+61 = 1271mm