I'm not sure if you are using your regular pressure cooker correctly. Your vegetables should come out similar as if you steamed them. You are probably cooking them too long. The pressure cooker also shouldn't have to vent all the time. At least with my Kuhn Rikkon you have to carefully adjust the temperature to ensure the food is at the right temperature and then very little venting should happen. Of course that also requires constant monitoring and adjusting. But most things only need pressure cooking for 5-10 minutes anyways.