Vlan issue with HP Procurve.

Dear EE's,

I have an vlan issue with hp procurve for a new requirement.

I have network setup as below.

Load balancer -> HP Swith (VLAN) -> Firewall (Sonicwall and Fortigate)

HP Swith is split in to 3 VLANs as below:
VLAN10 - Ports 1,3,5,7,9,11,13,15,17,19,21,23
VLAN20 - Ports 2-tagged,4,6,8,10,12
VLAN30 - Ports 2-tagged,14,16,18,20,22,24

Loadbalancer only got 1 Lan output it is connected to "Port 2" (tagged to VLAN20 & VLAN30)) of HP Switch, so i created sub-interface in Lan port of loadbalancer and define 2 subnets, LAN1(172.16.10.0/24 - VLAN ID 20) & LAN2(172.16.20.0/24 - VLAN ID 30).

Fortigate WAN1 is connected to "port 4" (vlan20) of hp switch and SonicWALL WAN1 is connected to "port 6" (vlan20).

Fortigate WAN2 is connected to "port 14" (vlan30) of hp switch and SonicWALL Wan2 is connected to "port 16" (vlan30).

My requirement is to achieve:
Fortigate WAN1 need to get 172.16.10.0 subnet
Fortigate WAN2 need to get 172.16.20.0 subnet

Sonicwall WAN1 need to get 172.16.10.0 subnet
Sonicwall WAN2 need to get 172.16.20.0 subnet

Unfortunately from loadbalancer only one 1 lan output. Please help me to achieve this.

---------------
What i tried already?

Port 2 made tagged and added to VLAN20 and VLAN30. But its not working.

Kindly support me.

Shamil
20160118_215028.jpg